Technique for excess loop delay compensation in delta-sigma modulators

摘要

A technique for excess loop delay compensation in delta sigma modulator. The delta sigma modulator includes a loop filter. The loop filter receives an analog input signal and an output of a digital to analog converter. A comparator receives an output of the loop filter and generates a digital output signal. A reference select logic unit receives the digital output signal as a feedback and generates one or more switching signals. One or more switches are coupled to the comparator and each switch receives a pre-computed reference voltage. The one or more switches are activated by the one or more switching signals in response to the digital output signal.

主权项

1. A delta sigma modulator comprising:
a loop filter configured to receive an analog input signal and an output of a digital to analog converter; a comparator configured to receive an output of the loop filter and to generate a digital output signal; a reference select logic unit configured to receive the digital output signal as a feedback and configured to generate one or more switching signals; and one or more switches coupled to the comparator, each switch of the one or more switches configured to receive a pre-computed reference voltage, wherein the one or more switches are configured to be activated by the one or more switching signals in response to the digital output signal, and wherein the pre-computed reference voltage is calculated from a multiplication factor.