CMOS amplifier with offset adaptation

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Patent

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Details

330261, 330307, 330308, H03F 345

Patent

active

050686224

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-Enhanced PROM, 1985 Chapel Hill Conference on Very Large Scale Integration, pp. 61-65.

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