Sigma-Delta analog-to-digital converter
An analog-to-digital converter and operational amplifier technology, applied in the direction of analog-to-digital converters, etc., can solve the problems of temperature drift and low-frequency noise offset of Sigma-Delta analog-to-digital converters, and achieve the effect of eliminating offset and ensuring conversion accuracy.
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[0044] As described in the Background Art, for figure 1 The Sigma-Delta analog-to-digital converter shown can eliminate the offset caused by its internal impedance mismatch by using off-chip calibration, but it cannot eliminate the offset caused by temperature drift and low-frequency noise (mainly 1 / f noise, that is, flicker noise ) caused by imbalance.
[0045] In order to eliminate the offset caused by temperature drift and low-frequency noise, the technical solution of the present invention provides a Sigma-Delta analog-to-digital converter with chopper technology. The chopping technique is to eliminate the offset voltage by modulating the offset voltage to a high frequency and then processing it through low-pass filtering. Specifically, a square wave signal is used to modulate the input signal to a high frequency, then the modulated input signal and the offset voltage are amplified together as the input signal of the amplifier, and finally the output signal of the amplifi...
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