Patent attributes
The present invention relates to digital to analog converters, and especially but not exclusively to switched capacitor digital to analog converters (DACs) for digital audio signals. The present invention provides a switched capacitor DAC for converting a digital signal and comprising a feedback capacitor coupled between an input and an output of an operational amplifier; a charging capacitor and a switching arrangement arranged during a charging period to couple a first side of said charging capacitor to a first reference voltage or a second reference voltage dependent on said digital signal, the switching arrangement further arranged during said charging period to couple a second side of the charging capacitor to the second reference voltage or the first reference voltage in anti-phase to the reference voltage coupled to said first side of the charging capacitor; the switching arrangement further arranged during a settling period to couple said charging capacitor to said feedback capacitor.
