Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1988-10-26
1989-12-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214AG, H01J 4014
Patent
active
048899852
ABSTRACT:
A combined optical power meter and receiver is provided in which the optical power meter retains high sensitivity and the optical receiver retains high bandwidth. A single photodiode provides current for both the optical power meter and the optical receiver. A first operational amplifier is configured as an integrating transimpedance amplifier having a current input which is referenced to a reference voltage and receives current from one port of the photodiode. A second operational amplifier is configured as a transimpedance amplifier having a current input which is referenced to ground and receives current from the other port of the photodiode. In this manner, a bias voltage is developed across the photodiode to decrease the capacitance and increase the operational speed of the receiver. A second material photodiode is provided which is shielded from the input light source is coupled to the current input of the first transimpedance amplifier. The polarity of the second photodiode is such that a path exists for the leakage current of the first photodiode, which decreases the sensitivity of the optical power meter to thermal variations in leakage current.
REFERENCES:
patent: 4236069 (1980-11-01), Laughlin
patent: 4415803 (1983-11-01), Muoi
patent: 4420724 (1983-12-01), Owen
patent: 4498001 (1985-02-01), Smoot
patent: 4764732 (1988-08-01), Dion
Hewlett-Packard Journal, pp. 18-26, Jan. 1985, "A Versatile, Programmable Optical Pulse Power Meter", (Werner Berkel, Hans Huning, Volker Eberle, Josef Becker, Bernd Maisenbacher, Wilfried Pless, and Michael Goder).
Allsop Bryan E.
Mabbitt Allen W.
Smith Kevin K.
Meza Peter J.
Nelms David C.
Oen William L.
Tektronix Inc.
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