Temperature-compensated voltage comparator

Details Temperature-compensated voltage comparator Temperature-compensated voltage comparator

2009-04-20

2010-11-30

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S089000, C327S083000, C327S513000

Reexamination Certificate

active

07843231

ABSTRACT:
A temperature-compensated voltage comparator (301) that compares first and second input voltages includes first and second bipolar junction transistors (BJTs) (221and222) that convert the first and second input voltages to first and second input currents, respectively. The first and second BJTs share a same thermal environment and their currents are dependent upon temperature. A temperature-compensating circuit (350), which includes a zero thermal coefficient reference (419), generates a logarithmic temperature-compensating factor that compensates for temperature dependency of the first and second BJTs. The temperature-compensating circuit receives one of the input currents, and outputs a temperature-compensated current that is said input current multiplied by the logarithmic temperature-compensating factor. The temperature-compensating circuit shares a thermal environment with the first and second BJTs. An output voltage is indicative of a differential between the first input voltage and the second input voltage, such that a threshold of the comparator is substantially temperature independent.

REFERENCES:
patent: 3569736 (1971-03-01), Tschinkel
patent: 4604532 (1986-08-01), Gilbert
patent: 5365129 (1994-11-01), Slemmer et al.
patent: 2002/0027469 (2002-03-01), Eagar et al.
Gilbert, B., “Translinear Circuits: A Proposed Classification”, IEEE Electronics Letters, 9thJan. 1975, pp. 14-16, vol. 11, No. 1.

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