Patent ID: 8624768

Claim:
A zero-crossing-based analog-to-digital converter having current mismatch correction capability, composed of a k th stage pipeline circuit and a (k+1) th stage pipeline circuit, said zero-crossing-based analog-to-digital converter comprising: a sub-analog-to-digital converter, located in said k th stage pipeline circuit, and relative to a sampling range step, it is provided with two comparators to handle respectively a maximum range step and a minimum range step, to avoid saturation distortion; a current supply branch circuit, disposed across said k th stage pipeline circuit and said (k+1) th stage pipeline circuit, and is provided with current supplies at two ends of current control switches in various parts of said k th stage pipeline circuit and said (k+1) th stage pipeline circuit, to eliminate signal dependence of voltage variations of said current control switches; at least one current mismatch correction circuit, located in said k th stage pipeline circuit, and is provided with at least two capacitors, to use a current redistribution principle to eliminate mismatch between a PMOS current supply an NMOS current supply in said k th stage pipeline circuit; and a zero-crossing detector circuit, located in said k th stage pipeline circuit to detect pseudo short circuit, when a switching signal in said k th stage pipeline circuit crosses zero.