Logarithmic amplifier having improved speed response

Details Logarithmic amplifier having improved speed response Logarithmic amplifier having improved speed response

1995-09-12

1996-06-18

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327561, H03G 1108, G06G 724

Patent

active

055281915

ABSTRACT:
A logarithmic amplifier includes an operational amplifier, an element for logarithmic conversion purposes connected to a feedback circuit of the operational amplifier, an oscillation prevention circuit having a capacitor connected in parallel with the logarithmic conversion element, and a control circuit for controlling the oscillation prevention circuit in such a way that the amount of feedback by way of the oscillation prevention circuit is reduced as an input current to the operational amplifier becomes smaller. To improve the high-speed response characteristics of the logarithmic operational amplifier, the operational amplifier is made up of a composite amplifier consisting of an FET input type operational amplifier and a bipolar input type operational amplifier.

REFERENCES:
patent: 3790819 (1974-02-01), Chamran
patent: 3965344 (1976-06-01), Romo
patent: 3971984 (1976-07-01), Bench
patent: 5126846 (1992-06-01), Niimura

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