Patent ID: 8830099
Filing Date: 2014-09-09
Classification: H03M

Abstract:
1. A multiplying digital-to-analog converter (MDAC) to generate a residue signal, the MDAC comprising: a set of switches configured to switch between at least a first voltage node and a second voltage node; a residue amplifier comprising an output that is configured to be charged to an output voltage, charging of the output of the residue amplifier induces a first current flowing at least into either one of first or second voltage nodes; a set of sampling capacitors coupled to the set of switches, the set of sampling capacitors is configured to receive voltages at the first and second voltage node; a feedback capacitor coupled to an input of the residue amplifier, the feedback capacitor is coupled to be charged to the output voltage; and one or more compensating current sources coupled to the set of switches, the one or more compensating current sources provide a compensating current that at least partially cancels the first current.