Integrated circuit using logarithmic amplifier

Details Integrated circuit using logarithmic amplifier Integrated circuit using logarithmic amplifier

1988-09-23

1990-03-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214A, G01J 350

Patent

active

049068369

ABSTRACT:
An integrated circuit includes an operational amplifier having inverting and noninverting input terminals, a first logarithmic amplifier having inverting and noninverting input terminals, and a second logarithmic amplifier having inverting and noninverting input terminals. The output of the first logarithmic amplifier is connected to the noninverting input terminal of the second logarithmic amplifier, and the output of the second logarithmic amplifier is connected to the inverting input terminal of the operational amplifier.

REFERENCES:
patent: 4309604 (1982-01-01), Yoshikawa et al.
patent: 4379636 (1983-04-01), Yoshida
patent: 4568978 (1986-02-01), Cosh

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