Technique for compensating switched capacitor circuits having ga

Details Technique for compensating switched capacitor circuits having ga Technique for compensating switched capacitor circuits having ga

1989-10-04

1991-05-14

Pellinen, A. D.

Coded data generation or conversion

Converter compensation

341150, H03M 106

Patent

active

050160125

ABSTRACT:
A technique for compensating for variations in a resistor set overall gain switched-capacitor circuits, such as high accuracy digital-to-analog converters. The variation in overall gain from the desired gain is due to the variation in the total capacitance of the capacitors, compared to the variation in the resistance of the resistor, in the circuit during manufacture. A bias circuit, with two reference voltage outputs, is adapted to have a capacitor and a fixed resistor vary one of the voltage references depending on the capacitance thereof. The voltage difference between the two voltage references varies the overall gain of the switched capacitor circuit to compensate for variations in the overall gain. Also, a switched-capacitor digital-to-analog converter utilizing the above technique is presented.

REFERENCES:
patent: 4404544 (1983-09-01), Dwarakanath
patent: 4568917 (1986-02-01), McKenzie et al.
patent: 4667179 (1987-05-01), Law et al.
patent: 4837572 (1989-06-01), Gulczynski

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