Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-02-23
1998-10-13
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
375318, 330252, H04B 1006
Patent
active
058221042
ABSTRACT:
An output signal of an opto-electric conversion element 1 is amplified by a differential type pre-amplifier 3 to a predetermined level and input to an ATC circuit 5 as a positive phase signal and an inverted phase signal. These signals are held in respective peak holding circuits 51 and 52 of the ATC circuit 5. The positive phase signal held in the peak holding circuit 51 is added by an adder 57 to the inverted phase signal from the pre-amplifier 3 and the inverted phase signal held in the peak holding circuit 52 is added by an adder 58 to the positive phase signal from the pre-amplifier 3. Resultant sum signals are compared by a comparator 7 with a reference and discriminated as logical "1" and "0". The positive phase signal from the pre-amplifier 3 is input to a self-reset circuit 9 including a level detector 91, a reset pulse generator and a reset circuit 93. The level detector 91 detects a signal from the pre-amplifier 3. The reset pulse generator 92 generates a reset signal in the form of a single pulse by using an output of the level detector 91. The reset circuit 93 uses the reset signal to discharge a holding capacitor of the peak holding circuit 52. Degradation of duty cycle and of signal amplitude due to offset of an input signal can be minimized.
REFERENCES:
patent: 4236256 (1980-11-01), Brackett et al.
patent: 5371763 (1994-12-01), Ota et al.
patent: 5430765 (1995-07-01), Nagahori
patent: 5430766 (1995-07-01), Ota et al.
patent: 5499244 (1996-03-01), Mosch et al.
Bacares Rafael
NEC Corporation
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