Analog-to-digital conversion circuit, production line analog-to-digital conversion circuit and control method

Abstract

The invention provides an analog-to-digital conversion circuit, a production line analog-to-digital conversion circuit and a control method. The analog-to-digital conversion circuit comprises an amplifying circuit, a first capacitor, a second capacitor, a switch unit, a compensating capacitor and a compensating control switch unit; the first input end of the amplifying circuit is connected to one end of the first capacitor, and while the other end of the first capacitor is suitably selectively connected one of common mode voltage or at least one reference voltage through the switch unit; the second input end of the amplifying circuit is connected with the common mode voltage; the second capacitor is connected between the first input end of the amplifying circuit and the first output end; one end of the compensating capacitor is connected to the common mode voltage, and while the other end of the compensating capacitor is suitably selectively connected to the common mode voltage or a reference voltage source which produces the at least one reference voltage through the compensating control switch unit. The analog-to-digital conversion circuit is able to stabilize the reference voltage so as to improve the linearity of the production line analog-to-digital conversion circuit.

Description

Technical field [0001] The invention relates to the field of electronics, in particular to an analog-to-digital conversion circuit, a pipeline analog-to-digital conversion circuit and a control method. Background technique [0002] An analog-to-digital conversion circuit converts an analog signal into a digital signal, and a common analog-to-digital converter converts an input voltage signal into an output digital signal. Since the digital signal itself has no practical meaning, it only represents a relative magnitude. Therefore, any analog-to-digital converter needs a reference analog quantity as the conversion standard, and the output digital quantity represents the magnitude of the input signal relative to the reference signal. This shows the importance of a stable reference voltage in the analog-to-digital conversion circuit, and the stability of the reference voltage of the existing analog-to-digital conversion circuit needs to be improved. Summary of the invention [0003]...

AI Technical Summary

Problems solved by technology

This shows the importance of a stable reference voltage in the analog-to-digital conversion circuit, and the stability of the reference voltage of the existing analog-to-digital conversion circuit needs to be improved

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