CMOS amplifier with offset adaptation

Details CMOS amplifier with offset adaptation CMOS amplifier with offset adaptation

1990-10-31

1992-04-28

Prenty, Mark

357 235, 357 59, 357 71, H01L 2714, H01L 2968, H01L 2904, H01L 2348

Patent

active

051092611

ABSTRACT:
An integrated circuit amplifier having a random input offset voltage is adaptable such that the input offset voltage may be cancelled out. An inverting input node is a floating input node and is coupled to a source of input signal by a first capacitor. A second capacitor is connected between the output of the amplifier and the floating node. An ultraviolet window above the second capacitor allows the floating node to be charged, by the application of ultraviolet light, to a voltage which effectively cancels the input offset voltage. The ultraviolet window and capacitor electrodes are arranged such that the ultraviolet light may strike only the desired areas of the structure.

REFERENCES:
patent: 4665426 (1987-05-01), Allen et al.
Glasser, A UV Write-Enabled PROM, 1985 Chapel Hill Conference on Very Large Scale Integration, pp. 61-65.

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