Analog-to-digital converter having enhanced accuracy gain stage,

Details Analog-to-digital converter having enhanced accuracy gain stage, Analog-to-digital converter having enhanced accuracy gain stage,

1998-09-08

2000-08-22

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 327 94, H03M 112

Patent

active

061079502

ABSTRACT:
An analog-to-digital converter (ADC) includes a plurality of capacitors formed on a semiconductor substrate and having actual capacitance values statistically related to desired capacitance values, and a gain stage comprising an amplifier and capacitors selected to provide a more accurate gain for the gain stage. A first at least one capacitor is connected between an input and an output of the amplifier defining a feedback capacitance, and a second at least one capacitor is connected between the input of the amplifier and an input of the at least one gain stage defining an input capacitance. In addition, the ADC includes a connection network selectively connecting the first at least one capacitor and the second at least one capacitor from among the plurality of capacitors to provide a desired ratio of feedback capacitance to input capacitance based upon the actual capacitance values. Accordingly, a gain can be set for the gain stage that is more accurate than would otherwise be obtained. The high accuracy switched capacitor gain stage may be used in other applications.

REFERENCES:
patent: 5434569 (1995-07-01), Yung et al.
patent: 5581252 (1996-12-01), Thomas
patent: 5680070 (1997-10-01), Anderson et al.
patent: 5771012 (1998-06-01), Shu et al.
Product Sheet for Harris Semiconductor HI5905, "14-Bit, 5 MSPS A/D Converter", (Jan. 1998).

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