Signal gate, a sampling network and an analog to digital converter comprising such a sampling network

摘要

A signal gate is provided where the gate can be low impedance to allow a signal to pass or be high impedance to block it. The signal gate has two output nodes arranged such that during the blocking mode spurious signals passing through the gate by way of parasitic components are presented as common mode signals at the output nodes.

主权项

1. A circuit system, comprising:
a signal gate coupled between a first input node and first and second output nodes, wherein the signal gate is arranged to provide, during a first mode, a low impedance path between the first input node and the first output node, and during a second mode, signal paths to the first and second output nodes such that voltage changes at the first input node give rise to common mode signals at the first and second output nodes.