US 9,793,917 B2 · Method and apparatus for adjusting a bandwidth of a sigma delta converter

Abstract

A method and apparatus for adjusting a bandwidth of a sigma delta converter by adjusting a reference voltage provided to the sigma delta converter. The apparatus includes a switched capacitor digital-to-analog converter in the feedback loop of the sigma delta modulator. The sigma delta modulator determines the bandwidth mode of the converter and adjusts the reference voltage to deliver high performance functionality. In one embodiment, a multi-bit digital signal is received by the digital-to-analog converter. The reference voltage is provided to multiple capacitive circuits of the digital-to-analog converter and the capacitive circuits are activated and deactivated based on the multi-bit digital signal. The digital-to-analog converter, thus, provides a feedback analog signal using dynamic element matching.

Claims20

Dependent claims

A method of adjusting a bandwidth of a sigma delta converter, the method comprising:

determining a bandwidth mode of a digital-to-analog converter;
receiving a digital input signal by a first capacitive circuit;
adjusting, by an electronic processor, a reference voltage received by a second capacitive circuit to a value corresponding to the bandwidth mode;
charging the first capacitive circuit using the digital input signal;
charging the second capacitive circuit using the reference voltage;
outputting a first discharge signal from the first capacitive circuit and a second discharge signal from the second capacitive circuit to an integrator;
and
outputting an integrated signal based on the first discharge signal and the second discharge signal from the integrator.

5 more elements

Dependencies are inferred from the claim text.

Method and apparatus for adjusting a bandwidth of a sigma delta converter

Life of this patent

Method and apparatus for adjusting a bandwidth of a sigma delta converter

Life of this patent

Abstract

Claims20