Switched capacitor DAC

Details Switched capacitor DAC Switched capacitor DAC

2006-09-05

2006-09-05

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S143000, C327S337000

Reexamination Certificate

active

07102557

ABSTRACT:
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.

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