Integrated circuit RC filters with very large time constants

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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328167, 307520, H03K 1716, H03K 500

Patent

active

049241150

ABSTRACT:
This circuit is an input noise filter. An RC circuit comprises a capacitor implemented from a transistor with source and drain tied together and a long transistor acting as a resistance which can either be large or small, depending on the bias. The output of the RC circuit is applied to a comparator where it is compared to a threshold voltage. When a signal is first applied to the input, the resistance is high, so that the RC circuit charges slowly. With the input signal still applied, after the comparator threshold is reached and the output from the comparator goes high, a feedback circuit senses the output and decreases the resistance, allowing the RC circuit to rapidly charge up. Finally, after the input signal ends, the feedback loop again raises the resistance to allow the RC voltage to discharge slowly to the threshold level, after which the comparator output goes low. The result is a circuit that does not shrink the digital input signal but still filters out input noise.

REFERENCES:
patent: 4305091 (1981-12-01), Cooper
patent: 4555669 (1985-11-01), Namiki
patent: 4701715 (1987-10-01), Amazawa et al.
patent: 4724395 (1988-02-01), Freeman

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