Temperature self-compensated time delay circuits

Details Temperature self-compensated time delay circuits Temperature self-compensated time delay circuits

1989-10-16

1992-01-14

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307594, 307597, 307603, 307605, 328 55, 328 66, 323312, 323315, H03K 5159, H03K 301, G05F 304, G05F 316

Patent

active

050813803

ABSTRACT:
A constant time delay circuit which is insensitive to variations in temperature and has no D.C. power disipation includes a temperature-insensitive reference current source (12) for dynamically charging and discharging a capacitive load (M5), a polysilicon resistor (16), and at least one time delay control circuit (14) to produce a constant time delay. In an alternate embodiment, there is provided a temperature self-compensated programmable delay circuit which includes electrically programmable resistor means (30) for adjusting the total resistance in a temperature-insensitive reference current source (12b). As a result, the amount of the reference current is controlled so as to obtain a desired delay time.

REFERENCES:
patent: 4473762 (1984-09-01), Iwahashi et al.
patent: 4931668 (1990-06-01), Kikuda et al.

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