Optical receiver circuit

Details Optical receiver circuit Optical receiver circuit

1993-04-29

1994-07-12

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 307311, 330 59, H01J 4014

Patent

active

053291158

ABSTRACT:
An optical receiver circuit for receiving optical signals is described incorporating a photodetector, two coupling capacitors for coupling each side of the photodetector to respective inputs of a transimpedance amplifier, two current mirror circuits for detecting current on each side of the coupling capacitor and injecting equivalent current to the other side of the other capacitor which is at the input of the transimpedance amplifier, two low pass filters, two current sources and a transimpedance amplifier having two inputs. An optical receiver for receiving optical signals is described incorporating a photodetector having one side coupled to a reference voltage, a current source, a coupling capacitor, a transimpedance amplifier, and a circuit for injecting AC current to the input of the amplifier from the voltage developed across the photodetector. The invention overcomes the problem of requiring large coupling capacitors in an optical receiver circuit to accommodate a low bandwidth due to a long string of 1's or 0's.

REFERENCES:
patent: 4498001 (1985-02-01), Smoot
patent: 4623786 (1986-11-01), Rodwell
patent: 4857725 (1989-08-01), Goodnough et al.
patent: 5013903 (1991-05-01), Kasper
patent: 5162754 (1992-11-01), Soares et al.

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