Patent ID: 9590653
Date: 2017-03-07
CPC Classifications: H03M

Claim:
1. A method of operating an analog-to-digital-conversion circuit, the analog-to-digital-conversion circuit comprising at least one digital-to-analog (DAC) capacitance in a plurality of DAC capacitances, the method comprising: deriving a charge voltage level from a charge voltage switch coupled to a supply voltage level and configured to be set to the charge voltage level, wherein the charge voltage level is set based on the supply voltage level and a reference voltage level supplied to the charge voltage switch; switching the at least one DAC capacitance to a first voltage source set to the charge voltage level; separating the at least one DAC capacitance from the first voltage source; switching the at least one DAC capacitance to a second voltage source set to the reference voltage level; separating the second voltage source from the at least one DAC capacitance; switching the at least one DAC capacitance to a third voltage source set to a discharge voltage level, wherein the switching of the at least one DAC capacitance to the first voltage source, the second voltage source, and the third voltage source is based on a DAC voltage.