Logarithmic amplifier

Details Logarithmic amplifier Logarithmic amplifier

1995-09-11

1996-11-26

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327561, H03G 1108, G06F 7556

Patent

active

055789587

ABSTRACT:
A logarithmic amplifier for preventing an abnormal output from occurring when receiving an excessive input. The logarithmic amplifier is provided with an operational amplifier for logarithmic conversion purposes and a feedback circuit for feeding back an output from the operational amplifier via a resistor connected to an output terminal of the operational amplifier. An element (for example, an element consisting of a Zener diode and a diode connected in series with each other) having an effective resistance which becomes smaller when a voltage above a predetermined value is applied to the element is connected in parallel with a resistor connected to an output terminal of an operational amplifier for logarithmic conversion purposes.

REFERENCES:
patent: 3760185 (1973-09-01), Green
patent: 3790819 (1974-02-01), Chamran
patent: 3967105 (1976-06-01), Harrington
patent: 4891603 (1990-01-01), Oda
patent: 5327029 (1994-07-01), Ericson et al.

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