Sigma-delta modulator and analog-to-digital converter

摘要

A Sigma-Delta modulator and an analog-to-digital converter. The Sigma-Delta modulator comprises a quantizer, a correction module and an RC integrator. The correction module comprises a predetermined resistance through which a correction level is generated. The correction module is used to compare the correction level with a predetermined reference voltage by using a comparator in the quantizer, so as to generate a digital correction signal, based on which the resistance in a resistance correction array in the RC integrator is corrected. The predetermined resistance is of the same type as the resistance in the resistance correction array in the RC integrator. The Sigma-Delta modulator and the analog-to-digital converter can correct the resistance deviation in the RC integrator.

主权项

1. A Sigma-Delta modulator, comprising a quantizer, a correction module and an RC integrator; wherein
the correction module comprises a predetermined resistor through which a correction level is generated and a combinational logical circuit; the correction module is configured to compare the correction level with a predetermined reference voltage by inputting the correction level into a first input end of each comparator in the quantizer and inputting a predetermined reference voltage into a second input end of each comparator in the quantizer, to obtain a comparison result from an output end of each comparator in the quantizer; obtain a digital correction signal from an output end of the combinational logical circuit by inputting the comparison result into an input end of the combinational logical circuit which performs logical transformation on the comparison result to restore signal sequence; and correct resistance of a resistance correction array in the RC integrator by inputting the digital correction signal into the resistance correction array, wherein the predetermined resistor is of the same type as resistors in the resistance correction array in the RC integrator.