Adaptive radio transceiver with a local oscillator

• US 7,031,668 B2
• Filed: 06/07/2002
• Issued: 04/18/2006
• Est. Priority Date: 10/21/1999
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Maryam, Darabi, Hooman, Rofougaran, Ahmadreza
• Primary Examiner(s): PEREZ GUTIERREZ, RAFAEL
• Application Number:
  US10/165,464
• Publication Number:
  US 20030067359A1
• Time in Patent Office: 1,411 Days
• Field of Search: 455/73, 455/75, 455/76, 455/84, 455/313, 455/323, 375/298, 375/344
• US Class Current: 455/75
• CPC Class Codes: H03B 21/01 by beating unmodulated signals of different frequencies
• CPC Class Codes: H03B 27/00 Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
• CPC Class Codes: H03H 11/1291 Current or voltage controlled filters
• CPC Class Codes: H03H 2011/0494 Complex filters
• CPC Class Codes: H03H 21/0001 Analogue adaptive filters
• CPC Class Codes: H03H 21/0012 Digital adaptive filters
• CPC Class Codes: H03J 2200/10 Tuning of a resonator by means of digitally controlled capacitor bank
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 17/104 of other parameters, e.g. DC offset, delay or propagation times
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/19 Self-testing arrangements

Abstract

An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. A transceiver, comprising:

a local oscillator comprising;

a quadrature oscillator that generates a first signal having a first frequency,

a quadrature frequency divider that generates a second signal from the first signal, the second signal having a second frequency, and

a first quadrature mixer that mixes the first signal and the second signal and produces a third signal having a third frequency; and

a transmitter having a second quadrature mixer, the second quadrature mixer mixing the third signal with a fourth signal.

2. A transceiver, comprising:

a local oscillator comprising;

an oscillator configured to generate a first signal having a first frequency,

a frequency divider configured to generate a second signal from the first signal, the second signal having a second frequency, and

a first mixer configured to mix the first signal and the second signal to produce a third signal having a third frequency, and

a transmitter having a second mixer configured to mix the third signal and a fourth signal.

3. The transceiver according to claim 2, wherein the oscillator, the frequency divider, the first mixer and the second mixer are each quadrature.

4. The transceiver according to claim 2, wherein the third frequency comprises a sum of the first frequency and the second frequency.

5. The transceiver according to claim 2, wherein the oscillator comprises a voltage controlled oscillator.

6. The transceiver according to claim 5, wherein the local oscillator comprises a phase locked loop configured to control the first frequency of the first signal generated by the voltage controlled oscillator.

7. The transceiver according to claim 6,

wherein the local oscillator comprises a second oscillator and a second frequency divider,

wherein the second frequency divider is coupled to the second oscillator, and

wherein the voltage controlled oscillator is phase locked to an output of the second frequency divider.

8. The transceiver according to claim 7, wherein the second frequency divider comprises a programmable divisor input.

9. The transceiver according to claim 8, further comprising:

a receiver having a third mixer configured to mix the third signal and a fifth signal with a first control signal applied to the programmable divisor input,

wherein the third signal and the fourth signal are mixed by the second mixer with a second control signal applied to the programmable divisor input, and

wherein the second control signal is different from the first control signal.

10. The transceiver according to claim 2, wherein the fourth signal comprises a baseband signal.

11. The transceiver according to claim 2, wherein the frequency divider is programmable.

12. A method of communications, comprising:

generating, by an oscillator, a first signal having a first frequency;

generating, by a frequency divider, a second signal having a second frequency, the second signal being generated from the first signal;

mixing the first signal and the second signal to produce a third signal having a third frequency; and

mixing the third signal and a fourth signal.

13. The method according to claim 12, wherein the mixing of the first signal and the second signal is performed by a first mixer.

14. The method according to claim 13, wherein the oscillator, the frequency divider and the first mixer are part of a local oscillator of a transceiver.

15. The method according to claim 14, wherein the oscillator comprises a voltage controlled oscillator.

16. The method according to claim 15, wherein the local oscillator comprises a phase locked loop that controls the first frequency of the first signal generated by the voltage controlled oscillator.

17. The method according to claim 16,

wherein the local oscillator comprises a second oscillator and a second frequency divider,

wherein the second frequency divider is coupled to the second oscillator, and

wherein the voltage controlled oscillator is phase locked to an output of the second frequency divider.

18. The method according to claim 17, wherein the second frequency divider comprises a programmable divisor input.

19. The method according to claim 18, further comprising:

mixing, by a third mixer of a receiver, the third signal and a fifth signal;

applying a first control signal to the programmable divisor input and

applying a second control signal to the programmable divisor input, the second control signal being different from the first control signal,

wherein the mixing of the third signal and the fourth signal is performed by a second mixer.

20. The method according to claim 13, wherein the mixing of the third signal and a fourth signal is performed by a second mixer.

21. The method according to claim 20, wherein the second mixer is part of a transmitter of a transceiver.

22. The method according to claim 21, wherein the oscillator, the frequency divider, the first mixer and the second mixer are each quadrature.

23. The method according to claim 12, wherein the third frequency comprises a sum of the first signal and the second signal.

24. The method according to claim 12, wherein the fourth signal comprises a baseband signal.

25. The method according to claim 12, wherein the frequency divider is programmable.