Wide dynamic range transimpedance amplifier

Details Wide dynamic range transimpedance amplifier Wide dynamic range transimpedance amplifier

2005-01-18

2005-01-18

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

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

C330S085000

Reexamination Certificate

active

06844784

ABSTRACT:
A wide dynamic range transimpedance amplifier for fiber optics receivers. An automatic transimpedance gain control and DC cancellation control feedback circuit include a pnp transistor that is connected with the input signal. The impedance seen at the emitter of the pnp transistor changes according to the average value of the photodiode input current. Thus, large signal amplitudes are attenuated at the input of the transimpedance amplifier by the transistor and small signal amplitudes are amplified. The transistor is a variable impedance that can increase the optical overload without diminishing or reducing the optical sensitivity of the transimpedance amplifier.

REFERENCES:
patent: 5012202 (1991-04-01), Taylor
patent: 5646573 (1997-07-01), Bayruns et al.
patent: 6239659 (2001-05-01), Grässle
patent: 6297701 (2001-10-01), Visocchi et al.
patent: 6404281 (2002-06-01), Kobayashi
patent: 6590455 (2003-07-01), Kobayashi
Design on Integrated Circuits for Optical Communications, Behzad Razavi, McGraw Hill, ISBN 0-07-122972-8.

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