Voltage-insensitive and temperature-compensated delay circuit fo

Details Voltage-insensitive and temperature-compensated delay circuit fo Voltage-insensitive and temperature-compensated delay circuit fo

1986-07-02

1988-05-24

Miller, Stanley D.

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307246, 307303, 307310, H03K 513, H03K 1756, H03K 326

Patent

active

047468238

ABSTRACT:
A delay circuit which is insensitive to variations in power supply voltage, which is temperature-compensated, and which is suitable for fabrication in a monolithic integrated circuit includes circuitry for charging a capacitive element through a resistive element from GND toward the power supply voltage. The voltage across the capacitive element is compared to a reference voltage by a voltage comparator, and the voltage comparator generates an output signal when the voltage on the capacitor becomes greater than the reference voltage. The reference voltage for the comparator is generated by a resistor divider connected between GND and the power supply voltage. Inasmuch as the reference voltage varies with changes in the power supply voltage in such a manner as to be maintained at a substantially fixed percentage of the power supply voltage, the time delay provided by the delay circuit is essentially independent of variations in power supply voltage. By utilizing resistors in the resistor divider that have differing temperature coefficients of resistance, the reference voltage for the comparator can be increased and decreased in a predetermined manner in response to increases and decreases in ambient temperature, allowing the time delay of the delay circuit to be adjusted in a predetermined manner as a function of temperature.

REFERENCES:
patent: 3073971 (1963-01-01), Daigle, Jr.
patent: 3073972 (1963-01-01), Jenkins
patent: 4110640 (1978-08-01), Ito
patent: 4521694 (1985-06-01), Ryzek et al.

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