Patent ID: 8374233

Claim:
A baseband modulator configured to code a component of a complex baseband signal into a discrete-time sequence string in a baseband for a switched amplifier, comprising: a digital pulse width modulator configured to receive the component of the complex baseband signal and generate a discrete-time pulse width modulated signal; a converter coupled to the digital pulse width modulator and configured to receive the discrete-time pulse width modulated signal and generate a pulse-width modulated time signal; and a switch configured to shift the pulse-width modulated time signal to a radio frequency (RF) carrier signal corresponding to the component and generate burst sequences to an input of the switched amplifier to drive operation of the switched amplifier, wherein the digital pulse width modulator further comprises: a cross-point estimator determining an estimated cross-point of a reference signal with the baseband component of the baseband signal; and a noise shaper reducing quantization errors resulting from condensing of a time resolution and coupled to a quantization element generating a quantized output signal.