Freescale Semiconductor,inc.

Hassan Ihs

Jalal Ouaddah

Babak Bastani

Frederic Schrive

A discrete time sigma-delta modulator apparatus for class-D operation comprises a feed-forward path having an input at one end thereof and an output at another end thereof. A first summation unit is coupled in the feed-forward path to a first integrator. A quantizer is coupled in the feed-forward path after the first integrator and a feedback path arrangement is coupled to an input of the first summation unit. A low pass filter is arranged in the feedback path arrangement so as only to drive the first integrator.

Sigma-delta modulator apparatus and method of generating a modulated output signal

A continuous time sigma delta converter has a filter and converter components having known non-ideal characteristics. A compensation circuit has error modelling components arranged to model the non-ideal characteristics of the converter. A summation block combines a compensation signal from the compensation circuit with a non-ideal output signal from the converter in order to provide a compensated output signal. This has substantially no effect on other modulator performance characteristics and contributes to the implementation of giga sample-per-second Continuous Time sigma deltas having the dynamic range capabilities of traditional DT sigma deltas.

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Hassan Ihs