Method and apparatus for digital amplitude and phase modulation

Details Method and apparatus for digital amplitude and phase modulation Method and apparatus for digital amplitude and phase modulation

2011-04-19

2011-04-19

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

C375S296000, C375S298000, C375S300000, C375S297000, C375S302000

Reexamination Certificate

active

07929637

ABSTRACT:
A transmitter using quadrature modulation includes a rectangular to polar converter for converting data symbols into a polar form, where each polar symbol has a magnitude signal and an angle signal. Digital phase modulation circuitry includes an all digital PLL circuit for generating a phase modulated RF carrier signal responsive to the angle signal frequency control word (FCW) and a carrier frequency FCW. A digitally controlled amplifier for amplifying the phase modulated signal is controlled by a digital amplitude control circuitry for controlling the gain of the digitally controlled amplifier responsive to the magnitude signal.

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