Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-07-19
2005-07-19
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140LS, C250S2140AG, C327S514000
Reexamination Certificate
active
06919550
ABSTRACT:
A detector is provided for short wave fiber optic communication having compensation to reduce detector jitter. The detector includes a photodetector providing a modulated current. A transimpedance amplifier is coupled to the photodetector receiving the modulated current and providing an output voltage signal. An output buffer is coupled to the transimpedance amplifier receiving the output voltage signal. The output buffer includes a differential transistor pair; a pair of source degeneration resistors connected to the differential transistor pair; and a capacitor coupled between connections of the differential transistor pair and the source degeneration resistors. The value of the capacitor coupled between connections of the differential transistor pair and the source degeneration resistors is selected to reduce jitter. The capacitor passes high slew rate transimpedance amplifier output voltage signals more readily than low slew rate transimpedance amplifier output voltage signals. The effect of the capacitor is to bypass the gain limiting effects of the source degeneration resistors. As a result the differential transistor pair accentuates high slew rates over lower ones so that detector jitter is reduced.
REFERENCES:
patent: 5966387 (1999-10-01), Cloutier
U.S. Appl. No. 09/995,108, filed Nov. 27, 2001, by Randolph B. Heineke and David John Orser entitled “Fiber Optic Transceiver Array and Fiber Optic Transceiver Channel for Short Wave Fiber Optic Communications”.
U.S. Appl. No. 09/995,107, filed Nov. 27, 2001, by Randolph B. Heineke and David W. Siljenberg entitled “Fiber Optic Transceiver Array for Implementing Testing”.
Heineke Randolph B.
Orser David John
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
JDS Uniphase Corporation
Pyo Kevin
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