Precision temperature sensor integrated circuit

Details Precision temperature sensor integrated circuit Precision temperature sensor integrated circuit

1998-05-28

2000-06-20

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

H01L 3500

Patent

active

060782080

ABSTRACT:
A precision temperature sensor produces a clock frequency which varies predictably over wide variations of ambient temperature. The invention has a oscillation generator, two independent current generators, a reference oscillator and a frequency counter. The outputs of the two independent current generators are combined to provide an approximately linear capacitor charging current which is directly proportional to changes in temperature. The capacitor charging current is used to drive the oscillation generator which outputs a clock frequency that is approximately linearly dependent on temperature with determinable slope and intercept. The frequency counter compares the output of the oscillation generator with the independent reference oscillator to compute a digital value for temperature. The precision temperature sensor is implemented on a single, monolithic integrated circuit.

REFERENCES:
patent: 4603306 (1986-07-01), Kleinberg
patent: 5465063 (1995-11-01), Fukuda et al.
patent: 5801982 (1998-09-01), Blodgett
patent: 5940786 (1999-08-01), Steeby

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