Low power high dynamic range sigma-delta modulator

Abstract

A low power, high dynamic range sigma-delta modulator comprises a quantizer followed by a digital integrator for generating an integrated digital signal from a quantized signal. The output of the digital integrator is coupled to a digital-to-analog converter in the feedback loop of the sigma-delta modulator.

Description

technical field [0001] The present invention relates to sigma-delta modulators, and more particularly, to low power high dynamic range sigma-delta modulators. Background technique [0002] Sigma-delta modulators are used for both analog-to-digital and digital-to-analog conversion. A sigma-delta modulator for an analog-to-digital converter (ADC) produces a digital output with a bit density proportional to the analog level of the input signal. A sigma-delta type analog-to-digital converter may include a sigma-delta modulator and a digital filter connected to the output of the sigma-delta modulator. The purpose of a digital filter is to attenuate signals and noise outside the signal band. The analog-to-digital converter may also include a decimator coupled to the output of the digital filter to reduce the data rate from the oversampling rate to the Nyquist rate. [0003] A sigma-delta modulator consists of: a noise shaping filter (loop filter) that performs noise shaping on ...

AI Technical Summary

Problems solved by technology

However, the entire dynamic range can only be processed by range switching, which can cause undesired signal dynamic artifacts

[0006] Some sigma-delta modulators use multibit quantizers, but only power comparators with changing inputs

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