Low noise switched capacitor digital-to-analog converter

Details Low noise switched capacitor digital-to-analog converter Low noise switched capacitor digital-to-analog converter

1991-12-02

1992-11-10

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341153, 341118, H03M 178, H03M 180, H03M 106

Patent

active

051628015

ABSTRACT:
A low-noise switched-capacitor DAC converts an integer number from an N-bit digital format into an analog voltage level by transferring charge between two appropriately ratioed capacitors using a plurality of switches. The switches select only an appropriate one of a plurality of capacitors to connect to an operational amplifier in accordance with any digital input. The sampled kT/C noise and switch charge injection from an N-bit DAC is thus beneficially reduced.

REFERENCES:
patent: 4077035 (1978-02-01), Yee
patent: 4667179 (1987-05-01), Law et al.
"Analog MS Integrated Circuits for Signal Processing" R. Gregorian et al., published by Wiley, pp. 417 et seq.

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