Multi-mode envelope restoration architecture for RF transmitters

• US 20070019757A1
• Filed: 09/19/2006
• Published: 01/25/2007
• Est. Priority Date: 09/17/2002
• Status: Active Grant

• Current Assignee: Jorma Matero
• Original Assignee: Jorma Matero
• Inventors: Matero, Jorma
• Granted Patent: US 7,236,542 B2
• Time in Patent Office: Days
• US Class Current: 375/297
• CPC Class Codes: H03F 3/2176 Class E amplifiers
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/361 Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation

Abstract

An RF transceiver having dual-mode envelope restoration architecture. I narrow-band applications such as GSM/EDGE, a switch-mode amplifier is used to provide an envelope signal for amplitude modulating the phase-modulated signals. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. Furthermore, in the wide-band mode, the envelope modulation is applied through the base of an emitter follower while the collector voltage is scaled to achieve a desired power output in the amplitude-modulated signals.

Claims

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19. A transceiver, comprising:

a signal processor for providing baseband data indicative of the information,

an envelope waveform providing module, responsive to the baseband data, for providing an envelope waveform indicative of an envelope of a modulated signal,

a phase modulating mechanism for providing a first signal in a first carrier frequency band and a second signal in a second carrier frequency band different from the first carrier frequency band,

a first amplification device, responsive to the envelope waveform and the first signal, for providing the modulated signal in the first carrier frequency band,

a second amplification device, responsive to the envelope waveform and the second signal, for providing the modulated signal in the second carrier frequency band, and

a band selection mechanism for selecting at least between the modulated signal in the first carrier frequency band and the modulated signal in the second carrier frequency band for transmission, wherein the first and second signals are phase modulated radio-frequency signals.

20. The transceiver of claim 19, wherein

the first carrier frequency band comprises a first range of radio frequencies and the second carrier frequency band comprises a second range of radio frequencies lower than the first range,

the baseband data is provided in a digital form, and

the envelope waveform providing module comprises a digital-to-analog converter for providing the envelope waveform for amplitude-modulating the first signal.

21. The transmitter of claim 20, wherein the envelope waveform providing module further comprises a pulse width modulator for providing the envelope waveform for amplitude-modulating the second signal.

22. The transmitter of claim 21, wherein the envelope waveform comprises a first waveform component and a second waveform component, and the pulse width modulator is adapted to provide the second waveform component for amplitude-modulating the second signal.

23. The transmitter of claim 21, wherein the envelope waveform comprises a first waveform component and a second waveform component, and the digital-to-analog converter is adapted to provide the first waveform component for amplitude-modulating the first signal.

24. The transmitter of claim 21, wherein the envelope waveform comprises a first waveform component and a second waveform component, and wherein

the digital-to-analog converter is adapted to provide the first waveform component, and

the pulse width modulator is adapted to provide the second waveform component, the transmitter further comprising an emitter-follower device having a collector, an emitter and a base, wherein

the second waveform component is provided to the collector of the emitter-follower device, and

the first waveform component is provided to the base of the emitter-follower device, so as to provide an envelope voltage at the emitter of the emitter-follower device for amplitude-modulating the first signal.

25. The transmitter of claim 24, wherein the second waveform component is scalable for achieving a desired output power in the modulated signal in the first carrier frequency band.

26. A transceiver, comprising:

a signal processor for providing baseband data indicative of the information,

an envelope waveform providing module, responsive to the baseband data, for providing an envelope waveform indicative of an envelope of a modulated signal,

a phase modulating mechanism for providing a first signal in a first carrier frequency band and a second signal in a second carrier frequency band different from the first carrier frequency band,

a first amplification device, responsive to the envelope waveform and the first signal, for providing the modulated signal in the first carrier frequency band,

a second amplification device, responsive to the envelope waveform and the second signal, for providing the modulated signal in the second carrier frequency band, and

a band selection mechanism for selecting at least between the modulated signal in the first carrier frequency band and the modulated signal in the second carrier frequency band for transmission, wherein

the first carrier frequency band comprises a first range of radio frequencies and the second carrier frequency band comprises a second range of radio frequencies lower than the first range,

the baseband data is provided in a digital form, and

the envelope waveform providing module comprises a pulse width modulator for providing the envelope waveform for amplitude-modulating the second signal.

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27. The transmitter of claim 26, further comprising

a module for controlling power of the first and second amplification devices.

28. The transmitter of claim 26, wherein the first carrier frequency band comprises a frequency band substantially at 1900 MHz.

29. The transmitter of claim 26, wherein the first carrier frequency band comprises a frequency band substantially at 1900 MHZ for wideband code-division multiple access applications, and the second carrier frequency band.

30. The transmitter of claim 26, wherein the first carrier frequency band comprises a frequency band substantially at 1900 MHZ for wideband code-division multiple access applications, and the second carrier frequency band comprises a frequency band substantially at 900 MHz for GSM applications.

28-1. The transmitter of claim 26, wherein the second carrier frequency band comprises a frequency band substantially at 900 MHz.

31. A transceiver, comprising:

means for providing baseband data indicative of the information,

means, responsive to the baseband data, for providing an envelope waveform indicative of an envelope of a modulated signal,

means for providing a first signal in a first carrier frequency band and a second signal in a second carrier frequency band different from the first carrier frequency band,

means, responsive to the envelope waveform and the first signal, for providing the modulated signal in the first carrier frequency band,

means, responsive to the envelope waveform and the second signal, for providing the modulated signal in the second carrier frequency band, and

means for selecting at least between the modulated signal in the first carrier frequency band and the modulated signal in the second carrier frequency band for transmission.

32. The transceiver of claim 31, wherein

the first carrier frequency band comprises a first range of radio frequencies and the second carrier frequency band comprises a second range of radio frequencies lower than the first range,

the baseband data is provided in a digital form, and

the envelope waveform providing means comprises means for providing the envelope waveform for amplitude-modulating the second signal.