Radio receiver and radio transmitter

• US 6,195,563 B1
• Filed: 12/18/1997
• Issued: 02/27/2001
• Est. Priority Date: 12/23/1996
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Samuels, John A.
• Primary Examiner(s): LE, THANH C
• Application Number:
  US08/993,012
• Time in Patent Office: 1,167 Days
• Field of Search: 455/427, 455/12.1, 455/552, 455/553, 455/93, 455/142, 455/81, 455/84, 455/85, 455/86, 455/575
• US Class Current: 455/84
• CPC Class Codes: H03D 7/163 the local oscillations of at least two of the frequency changers being derived from a single oscillator
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/0096 where a full band is frequency converted into another full band
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

A dual mode radio frequency receiver or transmitter capable of operating in a terrestrial mode in which signals are routed over a terrestrial network, and a satellite mode in which signals are routed over a satellite network. The radio frequency receiver includes a terrestrial front-end RF stage which receives signals from a terrestrial network, a satellite front-end RF stage which receives signals from a satellite network, and a common RF stage which includes mixing circuitry for frequency down-converting the signals received from the front-end RF stages.

Claims

1. A radio frequency receiver operable in a first mode and a second mode, the first mode being a terrestrial mode in which the receiver operates in a terrestrial network, the second mode being a satellite mode in which the receiver operates in a satellite network, the first and second modes corresponding respectively to signals operating at different frequencies and having different channel structures, the radio frequency receiver comprising:

a first front-end RF stage for receiving a terrestrial signal of the terrestrial network and providing a first output signal with a characteristic of the terrestrial signal;

a second front-end RF stage for receiving a satellite signal of the satellite network and providing a second output signal with a characteristic of the satellite signal;

a common RF stage including an input for receiving either the first output signal or the second output signal and including mixing circuitry for frequency down-converting the first and second output signal to enable subsequent decoding;

a switch for selectively coupling either said first output signal or said second output signal to said common RF stage; and

means for substantially equalizing a frequency of said first output signal with a frequency of said second output signal, wherein said switch is located between said equalizing means and said common RF stage, said equalizing means providing substantial equalization between the frequencies of said first and said second output signals before application of said first and said second output signals to said switch.

2. A radio frequency receiver as claimed in claim 1, wherein the first output signal is at a lower frequency than the frequency of the terrestrial signal, a lowering of the frequency from the value of the frequency of the terrestrial signal to the value of the frequency of the first output signal being accomplished by a single mixing stage.

3. A radio frequency receiver as claimed in claim 1, wherein the first front-end RF stage is a UHF stage which comprises mixing circuitry.

4. A radio frequency receiver as claimed in claim 1, wherein the first output signal is a substantially the same frequency as the frequency of the terrestrial signal.

5. A radio frequency receiver as claimed in claim 1, wherein the first output signal and the second output signal are at substantially the same frequency, and the second output signal is substantially the same as the terrestrial mode signal subsequent to processing by the RF receiver operable in the second mode.

6. A radio frequency receiver as claimed in claim 1, wherein the second output signal is at a lower frequency than the frequency of the satellite signal.

7. A radio frequency receiver as claimed in claim 1, wherein the second front-end RF stage comprises mixing circuitry, the second output signal being at an intermediate frequency.

8. A radio frequency receiver as claimed in claim 1, wherein the first front-end, the second front-end, and the common RF stages include filtering means and amplifying means.

9. A radio frequency receiver as claimed in claim 1, wherein the mixing circuitry of the common RF stage frequency down-converts the first or second output signal via an intermediate frequency.

10. A radio frequency receiver as claimed in claim 1, wherein the common RF stage includes said switch for selecting the first output signal in the terrestrial mode or for selecting the second output signal in the satellite mode.

11. A radio frequency receiver as claimed in claim 1, wherein the mixing circuitry of the common RF stage provides the frequency down-converted first or second output signal to base band circuitry which performs the subsequent decoding.

12. A radio frequency transmitter operable in a first mode and a second mode, the first mode being a terrestrial mode in which the transmitter operates in a terrestrial network, the second mode being a satellite mode in which the transmitter operates in a satellite network, the first and second modes corresponding respectively to signals operating at different frequencies and having different channel structures, the radio frequency transmitter comprising:

a common RF stage including mixing circuitry for frequency up-converting a modulation signal to an intermediate signal, and first and second outputs for providing the intermediate signal to a subsequent RF stage;

a first terminal RF stage for receiving the intermediate signal from the first output and transmitting a terrestrial signal with a characteristic of the intermediate signal for reception by the terrestrial network;

a second terminal RF stage for receiving the intermediate signal from the second output and transmitting a satellite signal with a characteristic of the intermediate signal for reception by the satellite network, a switch for selectively coupling either said first terminal RF stage or said second terminal RF stage to said common RF stage; and

means for offsetting a frequency of said terrestrial signal from a frequency of said satellite signal, wherein said switch is located between said offsetting means and said common RF stage, said offsetting means being operative to offset frequencies between said terrestrial and said satellite signals subsequent to passage of said terrestrial and said satellite signals via said switch.

13. A radio frequency transmitter as claimed in claim 12, wherein the terrestrial signal is at a higher frequency than the frequency of the intermediate signal, a raising of the frequency from the value the of frequency of the intermediate signal to the value of the frequency of the terrestrial signal being accomplished by a single mixing stage.

14. A radio frequency transmitter as claimed in claim 12, wherein said offsetting means comprises mixing circuitry located in the first terminal RF stage.

15. A radio frequency transmitter as claimed in claim 12, wherein the terrestrial signal is at substantially the same frequency as the frequency of the intermediate signal.

16. A radio frequency transmitter as claimed in claim 12, wherein the satellite signal is at a higher frequency than the frequency of the intermediate signal.

17. A radio frequency transmitter as claimed in claim 12 wherein said offsetting means comprises mixing circuitry located in the second terminal RF stage.

18. A radio frequency transmitter as claimed in claim 12, wherein the first terminal, the second terminal, and the common RF stages include filtering means and amplifying means.

19. A radio frequency transmitter as claimed in claim 12, wherein the common RF stage includes switching means for providing the frequency up-converted intermediate signal via the first output in the terrestrial mode or via the second output in the satellite mode.

20. A radio frequency transmitter as claimed in claim 12, wherein the common RF stage receives the modulation signal from base band circuitry.

21. A radio frequency transceiver comprising a receiver operable in a first mode and a second mode, the first mode being a terrestrial mode in which the receiver operates in a terrestrial network, the second mode being a satellite mode in which the receiver operates in a satellite network, the first and second modes corresponding respectively to signals operating at different frequencies and having different channel structures, the radio frequency receiver comprising:

a first front-end RF stage for receiving a terrestrial signal of the terrestrial network and providing a first output signal with a characteristic of the terrestrial signal;

a second front-end RF stage for receiving a satellite signal of the satellite network and providing a second output signal with a characteristic of the satellite signal;

a common RF stage including an input for receiving either the first output signal or the second output signal and including mixing circuitry for frequency down-converting the first and second output signal to enable subsequent decoding;

a receive switch for selectively coupling either said first output signal or said second output signal to said common RF stage; and

means for substantially equalizing a frequency of said first output signal with a frequency of said second output signal, wherein said receive switch is located between said equalizing means and said common RF stage, said equalizing means providing substantial equalization between the frequencies of said first and said second output signals before application of said first and said second output signals to said receive switch;

wherein the transceiver further comprises a radio frequency transmitter operable in a first mode and a second mode, the first mode being a terrestrial mode in which the transmitter operates in a terrestrial network, the second mode being a satellite mode in which the transmitter operates in a satellite network, the first and second modes corresponding respectively to signals operating at different frequencies and having different channel structures, the radio frequency transmitter comprising;

a common RF stage including mixing circuitry for frequency up-converting a modulation signal to an intermediate signal, and first and second outputs for providing the intermediate signal to a subsequent RF stage;

a first terminal RF stage for receiving the intermediate signal from the first output and transmitting a terrestrial signal with a characteristic of the intermediate signal for reception by the terrestrial network;

a second terminal RF stage for receiving the intermediate signal from the second output and transmitting a satellite signal with a characteristic of the intermediate signal for reception by the satellite network;

a transmit switch for selectively coupling either said first terminal RF stage or said second terminal RF stage to said common RF stage; and

means for offsetting a frequency of said terrestrial signal from a frequency of said satellite signal, wherein said transmit switch is located between said offsetting means and said common RF stage, said offsetting means being operative to offset frequencies between said terrestrial and said satellite signals subsequent to passage of said terrestrial and said satellite signals via said transmit switch.

22. A radio telephone including either one of or a combination of a receiver and/or a transmitter, the receiver being operable in a first mode and a second mode, the first mode being a terrestrial mode in which the receiver operates in a terrestrial network, the second mode being a satellite mode in which the receiver operates in a satellite network, the first and second modes corresponding respectively to signals operating at different frequencies and having different channel structures, the radio frequency receiver comprising:

a first front-end RF stage for receiving a terrestrial signal of the terrestrial network and providing a first output signal with a characteristic of the terrestrial signal;

a second front-end RF stage for receiving a satellite signal of the satellite network and providing a second output signal with a characteristic of the satellite signal;

a common RF stage including an input for receiving either the first output signal or the second output signal and including mixing circuitry for frequency down-converting the first and second output signal to enable subsequent decoding;

a receive switch for selectively coupling either said first output signal or said second output signal to said common RF stage; and

means for substantially equalizing a frequency of said first output signal with a frequency of said second output signal, wherein said receive switch is located between said equalizing means and said common RF stage, said equalizing means providing substantial equalization between the frequencies of said first and said second output signals before application of said first and said second output signals to said receive switch;

wherein the radio telephone further comprises a radio frequency transmitter operable in a first mode and a second mode, the first mode being a terrestrial mode in which the transmitter operates in a terrestrial network, the second mode being a satellite mode in which the transmitter operates in a satellite network, the first and second modes corresponding respectively to signals operating at different frequencies and having different channel structures, the radio frequency transmitter comprising;

a common RF stage including mixing circuitry for frequency up-converting a modulation signal to an intermediate signal, and first and second outputs for providing the intermediate signal to a subsequent RF stage;

first terminal RF stage for receiving the intermediate signal from the first output and transmitting a terrestrial signal characteristic of the intermediate signal for reception by the terrestrial network;

a second terminal RF stage for receiving the intermediate signal from the second output and transmitting a satellite signal with a characteristic of the intermediate signal for reception by the satellite network;

a transmit switch for selectively coupling either said first terminal RF stage or said second terminal RF stage to said common RF stage; and

means for offsetting a frequency of said terrestrial signal from a frequency of said satellite signal, wherein said transmit switch is located between said offsetting means and said common RF stage, said offsetting means being operative to offset frequencies between said terrestrial and said satellite signals subsequent to passage of said terrestrial and said satellite signals via said transmit switch.

23. A radio frequency receiver operable in a first mode and a second mode, the first mode being a terrestrial mode in which the receiver operates in a terrestrial network, the second mode being a satellite mode in which the receiver operates in a satellite network, the radio frequency receiver comprising:

a first front-end RF stage for receiving a terrestrial signal of the terrestrial network and providing a first output signal with a characteristic of the terrestrial signal;

a second front-end RF stage for receiving a satellite signal of the satellite network and providing a second output signal with a characteristic of the satellite signal;

a common RF stage including an input for receiving either the first output signal or the second output signal and including first mixing circuitry for frequency down-converting the first and second output signal to enable subsequent decoding;

second mixing circuitry operative with at least one of said first front-end RF stage and said second front-end RF stage for substantially equalizing a frequency of said first output signal with a frequency of said second output signal; and

a switch for selectively coupling either said first output signal or said second output signal to said common RF stage;

wherein said switch is located between said second mixing circuitry and said common RF stage, said second mixing circuitry providing substantial equalization between the frequencies of said first and said second output signals before application of said first and said second output signals to said switch.

24. A radio frequency transmitter operable in a first mode and a second mode, the first mode being a terrestrial mode in which the transmitter operates in a terrestrial network, the second mode being a satellite mode in which the transmitter operates in a satellite network, the radio frequency transmitter comprising:

a common RF stage including first mixing circuitry for frequency up-converting a modulation signal to an intermediate signal, and first and second outputs for providing the intermediate signal to a subsequent RF stage;

a first terminal RF stage for receiving the intermediate signal from the first output and transmitting a terrestrial signal characteristic of the intermediate signal for reception by the terrestrial network;

a second terminal RF stage for receiving the intermediate signal from the second output and transmitting a satellite signal characteristic of the intermediate signal for reception by the satellite network;

transmit mixing circuitry operative with at least one of said first output and said second output for offsetting a frequency of said terrestrial signal from a frequency of said satellite signal; and

a switch for selectively coupling either said first terminal RF stage or said second terminal RF stage to said common RF stage;

wherein said switch connects an output terminal of said first mixing circuitry with the first and the second outputs of said common RF stage, said transmit mixing circuitry being operative to offset frequencies between said terrestrial and said satellite signals subsequent to passage of said terrestrial and said satellite signals via said switch.

25. A radio frequency transceiver comprising a receiver operable in a first mode and a second mode, the first mode being a terrestrial mode in which the receiver operates in a terrestrial network, the second mode being a satellite mode in which the receiver operates in a satellite network, the radio frequency receiver comprising:

a first front-end RF stage for receiving a terrestrial signal of the terrestrial network and providing a first receive output signal characteristic of the terrestrial signal;

a second front-end RF stage for receiving a satellite signal of the satellite network and providing a second receive output signal characteristic of the satellite signal;

a common RF receiving stage including an input for receiving either the first receive output signal or the second receive output signal and including first mixing circuitry for frequency down-converting the first and the second receive output signals to enable subsequent decoding;

receive mixing circuitry operative with at least one of said first front-end RF stage and said second front-end RF stage for substantially equalizing a frequency of said first receive output signal with a frequency of said second receive output signal;

a receive switch for selectively coupling either said first receive output signal or said second receive output signal to said common RF receiving stage, wherein said receive switch is located between said receive mixing circuitry and said common RF stage, said receive mixing circuitry providing substantial equalization between the frequencies of said first and said second receive output signals before application of said first and said second receive output signals to said receive switch; and

wherein the transceiver further comprises a radio frequency transmitter operable in a first mode and a second mode, the first mode being a terrestrial mode in which the transmitter operates in a terrestrial network, the second mode being a satellite mode in which the transmitter operates in a satellite network, the radio frequency transmitter comprising;

a common RF transmitting stage including intermediate mixing circuitry for frequency up-converting a modulation signal to an intermediate signal, and first and second transmit outputs of said intermediate mixing circuitry for providing the intermediate signal to a subsequent RF stage;

a first terminal RF stage for receiving the intermediate signal from the first transmit output and transmitting a terrestrial signal characteristic of the intermediate signal for reception by the terrestrial network;

a second terminal RF stage for receiving the intermediate signal from the second transmit output and transmitting a satellite signal characteristic of the intermediate signal for reception by the satellite network;

transmit mixing circuitry operative with at least one of said first transmit output and said second transmit output for offsetting a frequency of said terrestrial signal from a frequency of said satellite signal; and

a transmit switch for selectively coupling either said first terminal RF stage or said second terminal RF stage to said common RF transmitting stage, wherein said transmit switch connects an output terminal of said intermediate mixing circuitry with the first and the second transmit outputs of said common RF stage, said transmit mixing circuitry being operative to offset frequencies between said terrestrial and said satellite signals subsequent to passage of said terrestrial and said satellite signals via said transmit switch.

26. A radio telephone including either one of or a combination of a receiver and/or a transmitter, the receiver being operable in a first mode and a second mode, the first mode being a terrestrial mode in which the receiver operates in a terrestrial network, the second mode being a satellite mode in which the receiver operates in a satellite network, the radio frequency receiver comprising:

a first front-end RF stage for receiving a terrestrial signal of the terrestrial network and providing a first receive output signal characteristic of the terrestrial signal;

a second front-end RF stage for receiving a satellite signal of the satellite network and providing a second receive output signal characteristic of the satellite signal;

a common RF receiving stage including an input for receiving either the first receive output signal or the second receive output signal and including first mixing circuitry for frequency down-converting the first and the second receive output signals to enable subsequent decoding;

receive mixing circuitry operative with at least one of said first front-end RF stage and said second front-end RF stage for substantially equalizing a frequency of said first receive output signal with a frequency of said second receive output signal;

a receive switch for selectively coupling either said first receive output signal or said second receive output signal to said common RF receiving stage, wherein said receive switch is located between said receive mixing circuitry and said common RF stage, said receive mixing circuitry providing substantial equalization between the frequencies of said first and said second receive output signals before application of said first and said second receive output signals to said receive switch; and

wherein the radio telephone further comprises a radio frequency transmitter operable in a first mode and a second mode, the first mode being a terrestrial mode in which the transmitter operates in a terrestrial network, the second mode being a satellite mode in which the transmitter operates in a satellite network, the radio frequency transmitter comprising;

a common RF transmitting stage including intermediate mixing circuitry for frequency up-converting a modulation signal to an intermediate signal, and first and second transmit outputs for providing the intermediate signal to a subsequent RF stage;

a first terminal RF stage for receiving the intermediate signal from the first transmit output and transmitting a terrestrial signal characteristic of the intermediate signal for reception by the terrestrial network;

a second terminal RF stage for receiving the intermediate signal from the second transmit output and transmitting a satellite signal characteristic of the intermediate signal for reception by the satellite network;

transmit mixing circuitry operative with at least one of said first transmit output and said second transmit output for offsetting a frequency of said terrestrial signal from a frequency of said satellite signal; and

a transmit switch for selectively coupling either said first terminal RF stage or said second terminal RF stage to said common RF transmitting stage, wherein said transmit switch connects an output terminal of said intermediate mixing circuitry with the first and the second transmit outputs of said common RF stage, said transmit mixing circuitry being operative to offset frequencies between said terrestrial and said satellite signals subsequent to passage of said terrestrial and said satellite signals via said transmit switch.