Anti-logarithmic amplifier designs

Details Anti-logarithmic amplifier designs Anti-logarithmic amplifier designs

2007-06-22

2009-06-09

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Exponential

C327S334000

Reexamination Certificate

active

07545197

ABSTRACT:
An anti-exponential amplifier produces an output signal that is an exponential/anti-logarithmic function of an input signal. The amplifier includes three function generators and a low-pass filter. The first function generator produces a periodic exponential waveform based upon a resistor-capacitor time constant, with the magnitude of the periodic exponential waveform exponentially increasing to a maximum value in each period. A second function generator produces a ramp waveform from the exponential waveform. The ramp waveform has a period and maximum amplitude substantially equal to those of the exponential signal. The third function generator produces a hybrid waveform with a first portion and a second portion, with the duration of the first period determined in response to the ramp waveform. A low pass filter produces the anti-logarithmic output signal as a function of the hybrid waveform. The resulting amplifier could be useful in a brightness or other parameter control for a display.

REFERENCES:
patent: 3849706 (1974-11-01), Johnson et al.
patent: 4168492 (1979-09-01), Uya
Olson, Scot, U.S. Appl. No. 11/756,002, filed May 31, 2007.

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