Trimming circuitry for pipeline A/D converter

Details Trimming circuitry for pipeline A/D converter Trimming circuitry for pipeline A/D converter

1998-11-10

2000-11-21

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341150, 341172, H03M 162

Patent

active

06150968&

ABSTRACT:
A trimming circuit for a gain stage in a pipeline analog-to-digital converter includes an amplification stage (30) having associated therewith on one input thereof a coupling capacitor (38). In parallel with the coupling capacitor is provided a trimming network. The trimming network includes a series configuration of a coupling capacitor and a plurality of trimming capacitors, which trimming capacitors can be disposed in parallel with each other. Each of the trimming capacitors has associated therewith a switch which allows them to be selectively disposed in series with a coupling capacitor (42) and in parallel with each other. This trimming network is connected in parallel with the sampling capacitor (38). The input to the amplifier is isolated from the trimming network with a buffer (62) which is operable to isolate the impedance of the trimming capacitors from the input and from preceding stages.

REFERENCES:
patent: 4200863 (1980-04-01), Hodges et al.
patent: 5581252 (1996-12-01), Thomas
patent: 5600322 (1997-02-01), Garavan
patent: 5852415 (1998-12-01), Cotter et al.
patent: 6031480 (2000-02-01), Soenen et al.

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