Logarithmic temperature compensation for detectors

Details Logarithmic temperature compensation for detectors Logarithmic temperature compensation for detectors

2007-02-20

2007-02-20

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

C327S513000

Reexamination Certificate

active

11020897

ABSTRACT:
The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T0. The first H factor is cancelled, thereby generating a correction signal having the form Y log H. The cancellation may be implemented with a transconductance cell having a hyperbolic tangent function. The H log H function may be generated by a pair of junctions biased by one temperature-stable current and one temperature-dependent current. The pair of junctions and the transconductance cell may be coupled together in a translinear loop. A user-accessible terminal may allow adjustment of the correction signal for different operating frequencies.

REFERENCES:
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patent: 5296761 (1994-03-01), Fotowat-Ahmady et al.
patent: 5352973 (1994-10-01), Audy
Gilbert, Barrie; Translinear Circuits: An Historical Overview, 1996,Analog Integrated Circuits and Signal Processing, pp. 95-118.
Gilbert, Barrie;Monolithic Logarithmic Amplifiers, Aug. 1994, Analog Devices, Inc., pp. 1-122.
DC-Coupled Demodulating 120 MHz Logarithmic Amplifier(AD640), 1999, Analog Devices, Inc., pp. 1-16 (Rev. C).
Gilbert, Barrie, Analog Devices, Inc.;Monolithic Logarithmic Amplifiers, Aug. 1994, pp. 1-122.

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