Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-12-21
1996-07-02
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
330283, 330284, 327312, 327483, 327205, 359194, H01J 4014
Patent
active
055324711
ABSTRACT:
A preamplifier for use with currents developed by a photodetecting diode is disclosed wherein the currents are coupled to the base of an NPN transistor connected as a common emitter stage and a feedback resistor is connected by way of a buffer amplifier to the base to provide a standard transimpedance configuration. A control loop monitors the signal level by integrating the output of the buffer amplifier, and upon the detection of large signals the control loop causes a MOSFET in parallel with the feedback resistor to decrease the transimpedance and thereby increase the signal handling capability of the preamplifier. The control loop is also connected to a second MOSFET in parallel with the collector load resistor of said NPN transistor to decrease the effective collector load impedance for large signal levels. A third MOSFET in parallel with a resistor in the emitter of the NPN transistor is also responsive to the signal level in order to increase the amount of resistance in the emitter circuit of said common amplifier stage for large signal levels.
REFERENCES:
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patent: 5363064 (1994-11-01), Mikamura
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Robert J. Bayruns et al., "Monolithic GaAs Transimpedance Amplifiers for Fiber-Optic Receivers", IEEE Journal of Solid State Circuits, vol. 26, No. 12, Dec. 1991, pp. 1834-1839.
Khorramabadi Haideh
Tarsia Maurice J.
Tzeng Liang D.
AT&T Corp.
Calogero Stephen
Westin Edward P.
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