Polar transmitter with digital to RF converter

Details Polar transmitter with digital to RF converter Polar transmitter with digital to RF converter

2005-04-29

2008-09-09

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transmitters

C375S297000, C455S118000, C455S102000, C341S155000, C341S166000

Reexamination Certificate

active

07424064

ABSTRACT:
A polar transmitter, operable in linear mode or switched mode, uses a conversion module to convert baseband signals into amplitude data and phase data. The phase data is used to phase modulate a carrier frequency in a radio frequency conversion module. The module comprises a plurality of parallel unit cells, each being a mixer cell type converter having a differential data switch section connected in series to a differential local oscillator-switch pair. The differential local oscillator-switch is connected in series to a current source. Each unit cell is adapted to receive a signal through an input end. In switched mode, the phase-modulated carrier frequency is amplitude modulated by the amplitude data through the supply voltage to a power amplifier. In linear mode, amplitude data is conveyed to the input end of the unit cells for modulating the phase-modulated carrier frequency in the conversion module.

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