Transimpedance amplifier

Details Transimpedance amplifier Transimpedance amplifier

1990-03-15

1991-07-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

250214A, 330110, 330296, H03F 308

Patent

active

050309250

ABSTRACT:
A transimpedance amplifier comprises a transconductance amplifier having a nonlinear resistive feedback element. The feedback element includes a pair of resistors and a pair of diodes, one of which conducts (depending upon the voltage polarity) only when the voltage across the diode exceeds the diode on-voltage. This includes additional resistance in the feedback element thereby changing the amplifier gain. The largest value of the resistive feedback element is substantially equal to or less than the output resistance of the transconductance amplifier. The feedback element is both symmetrical and nonlinear. A shunt amplifier is driven by circuit which produces a control signal that varies with a signal current. Increasing signal current increases the DC current shunted from the amplifier input thus decreasing pulse edge distortion and increasing dynamic range. A capacitor AC couples the current input to the amplifier.

REFERENCES:
patent: 3999060 (1976-12-01), Skagerlund
patent: 4218613 (1980-08-01), Bletz
patent: 4415803 (1983-11-01), Muoi
patent: 4540952 (1985-09-01), Williams
patent: 4620321 (1986-10-01), Chown
"Infra-Red Receiver", Electronics Today International, vol. 10, No. 11, Nov. 1981, p. 68.

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