CMOS Schmitt trigger and oscillator

Details CMOS Schmitt trigger and oscillator CMOS Schmitt trigger and oscillator

1979-04-02

1981-10-13

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307228, 307290, 331111, H03K 3295, H03K 3354, H03K 448

Patent

active

042950627

ABSTRACT:
A CMOS Schmitt trigger circuit displays a lower trigger point that is one N channel transistor threshold above the negative power supply potential and an upper trigger point that is one P channel transistor threshold below the positive power supply potential. Thus, the circuit hysteresis loop is related to supply potential and device threshold values. When the trigger circuit is employed in a relaxation oscillator configuration, the oscillator frequency is independent of power supply voltage and manufacturing variables in the CMOS process that vary transistor threshold values.

REFERENCES:
patent: 3812384 (1974-05-01), Skorup
patent: 3851189 (1974-11-01), Moyer
patent: 3873856 (1975-03-01), Gerlach
patent: 3904988 (1975-09-01), Hsiao
patent: 3921101 (1975-11-01), McCoy et al.
patent: 3984703 (1976-10-01), Jorgensen
patent: 4001722 (1977-01-01), Patel et al.
patent: 4063225 (1977-12-01), Stewart
patent: 4107549 (1978-08-01), Mouftah
patent: 4110704 (1978-08-01), Irwin et al.
patent: 4122413 (1978-10-01), Chen

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