Patent ID: 7564391
Filing Date: 2009-07-21
Classification: H03M

Abstract:
1. A sigma delta modulator comprising: A. first summer/subtractor circuitry having a summing input, a subtractor input, and an output; B. first loop filter circuitry having an input connected with the output of the first summer/subtractor circuitry and having an output; C. second summer/subtractor circuitry having plural summing inputs and an output; D. amplifier circuitry having an input connected to the output of the second summer/subtractor circuitry and having a plural bit output; E. digital to analog converter circuitry having an input connected to the output of the amplifier circuitry and having an output connected to the subtractor input of the first summer/subtractor circuitry; and F. quantizer circuitry having an input connected to the output of the first loop filter circuitry and including plural single bit noise shaped modulator circuitry, each modulator circuitry including: