Patent ID: 7095819

Claim:
A multiple-mode amplitude and phase direct modulator circuit, comprising: a phase modulator leg, comprising: compensation circuitry for applying delay compensation to an input phase signal; a modulation loop, for receiving the compensated input phase signal and for producing a phase-modulated output signal as a first mode output signal; and a frequency multiplier, coupled to the modulation loop, for multiplying the frequency of the phase-modulated output signal; an amplitude modulator leg, comprising: a digital-to-analog converter, for converting an input amplitude digital sequence to an analog amplitude modulated signal; and a mixer, having a first input coupled to the frequency multiplier to receive the phase-modulated output signal, having a second input coupled to the digital-to-analog converter to receive the analog amplitude-modulated signal, the mixer for combining the multiplied phase-modulated output signal and the analog amplitude-modulated signal into a second mode output signal.