Multi-mode envelope restoration architecture for RF transmitters
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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.
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Citations
32 Claims
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19. A transceiver, comprising:
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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. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A transceiver, comprising:
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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. - View Dependent Claims (1, 27, 28, 29, 30)
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28-1. The transmitter of claim 26, wherein the second carrier frequency band comprises a frequency band substantially at 900 MHz.
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31. A transceiver, comprising:
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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. - View Dependent Claims (32)
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Specification