Logarithmic detector or logarithmic amplifier having chopper...

Details Logarithmic detector or logarithmic amplifier having chopper... Logarithmic detector or logarithmic amplifier having chopper...

2007-09-11

2007-09-11

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

C327S351000, C327S352000

Reexamination Certificate

active

11336080

ABSTRACT:
One embodiment of the present invention is directed to an apparatus for reducing errors affecting the intercept of a logarithmic device, the apparatus including a first switching device coupled to an input of the logarithmic device. The first switching device for switches the input of the logarithmic device between an input signal and a reference signal. The apparatus further includes a polarity switching device coupled to an output of the logarithmic device. The polarity switching device is configured to switch the polarity of an output signal of the logarithmic device when the logarithmic device is receiving one of the input signal and the reference signal. The apparatus further includes a low pass filter coupled to the polarity switching device.

REFERENCES:
patent: 4990803 (1991-02-01), Gilbert
patent: 5345185 (1994-09-01), Gilbert
patent: 5451895 (1995-09-01), Lim
patent: 5570055 (1996-10-01), Gilbert
“Limiting-Logarithmic Amplifiers” Author Barrie Gilbert, Analog Devices Beaverton, OR Electronics Laboratories Advanced Engineering Course on RF IC Design for Wireless Communication Systems. Lausaane Switzerland Jul. 3-7, 1995.

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