Patent ID: 9225349
Filing Date: 2015-12-29
Classification: H03L,H03M,H04B,H04L

Abstract:
1. A circuit assembly for use in multi-stage noise shaping (MASH) modulator configured to generate a cyclic code sequence, the circuit assembly comprising: a first dither-less delta-sigma modulator providing a first cyclic output code and including a first modulator feedback loop and a first scaling feedback loop that includes a first gain circuit configured to introduce a first scaled version of the first cyclic output code into the first modulator feedback loop to disrupt tonal behavior due to the first cyclic output code, the first dither-less delta-sigma modulator further including a first filter configured to process a first error signal provided by the first modulator feedback loop to provide a first modulator feedback signal; and a second dither-less delta-sigma modulator providing a second cyclic output code and including a second modulator feedback loop and a second scaling feedback loop that includes a second gain circuit configured to introduce a second scaled version of the second cyclic output code into the second modulator feedback loop to disrupt tonal behavior due to the second cyclic output code, the second dither-less delta-sigma modulator further including a second filter configured to process a second error signal provided by the second modulator feedback loop to provide a second modulator feedback signal.