Reproducing circuit of monitor signal

Details Reproducing circuit of monitor signal Reproducing circuit of monitor signal

1995-11-16

1998-03-17

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359177, 359110, 375317, 250551, H04B 1006

Patent

active

057293732

ABSTRACT:
A reproducing circuit is disclosed having a photo-diode for extracting a signal component of a monitor signal from an electric signal converted from an optical signal using a band pass filter 108 and an envelope detector circuit 111. The output of the photo-diode 106 is smoothed by a capacitor 12 via a buffer amplifier 11. A threshold voltage control circuit 13 converts the smoothed signal voltage with a predetermined ratio to produce a threshold voltage. A discriminator 115 converts the extracted monitor signal component into a binary signal using the threshold voltage as a reference. Since the smoothed voltage varies in accordance with the average intensity of optical signal, the monitor signal can be appropriately converted into a binary signal in accordance with the intensity of optical signal. Further, since the smoothing is performed by a capacitor, the circuit structure can be simplified.

REFERENCES:
patent: 5291326 (1994-03-01), Heidemann
patent: 5485302 (1996-01-01), Brown et al.
Haas et al --"Optical Receives Having Continuous Verification Feature", IBM Technical Disclosure Bulletin, vol. 23, NO. 6, Nov. 1980 pp. 2436-2437.

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