Reducing the number of trim links needed on multi-channel analog

Details Reducing the number of trim links needed on multi-channel analog Reducing the number of trim links needed on multi-channel analog

1994-10-26

1997-01-21

Williams, Howard L.

Coded data generation or conversion

Converter calibration or testing

341143, 341118, H03M 110, H03G 300

Patent

active

055963226

ABSTRACT:
A method and structure for automatically calibrating various paths within multi-channel analog integrated circuits is disclose. The invention calls for digital signal processing circuitry to correct for absolute gain differences in the multiple channels. A first reference channel is precision trimmed at manufacture and used by the digital processing circuitry as a reference for channel gain calibration. When the circuit is powered for use, the other channels are calibrated based on the trimmed and calibrated reference. The need for providing the circuitry to precision trim all other channels but one is avoided by this invention.

REFERENCES:
patent: 4777471 (1988-10-01), Comer
patent: 4794343 (1988-12-01), Yang
patent: 5248970 (1993-09-01), Sooch et al.
AT&T "T7531 and T7535 Chip Set 16-Channel Programmable PCM Codec" 4 pages.
Goodenough "12-Bit IC ADCs Guarantee .+-. LSB From -55.degree. To +125.degree. C." Preliminary Data Sheet, Aug. 30, 1994, pp. 1-39.

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