Circuit for using capacitor voltage divider in a delta-sigma...

Details Circuit for using capacitor voltage divider in a delta-sigma... Circuit for using capacitor voltage divider in a delta-sigma...

2005-11-15

2005-11-15

Nguyen, John B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S120000, C341S145000, C341S150000

Reexamination Certificate

active

06965333

ABSTRACT:
An improved circuit for a delta-sigma digital-to-analog converter comprises integrating operational amplifier, sampling capacitors, integrating capacitor, and a voltage divider consisting of a plurality of sampling capacitors. Three trigger signals of different phases are designed to control three sets of switches, a first trigger signal only turns on and off a first set of switches, so as to charge the plurality of sampling capacitors, a second trigger signal only turns on and off a second set of switches, so as to enable the charge on one of the sampling capacitor and the charge on the integrating capacitor to be averaged, a third trigger signal only turns on and off a third set of switches, to enable the plurality of sampling capacitors to be discharged.

REFERENCES:
patent: 6140950 (2000-10-01), Oprescu
patent: 6147522 (2000-11-01), Rhode et al.
patent: 6570519 (2003-05-01), Yang
patent: 6573850 (2003-06-01), Pennock

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