Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1998-03-23
2000-03-14
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327362, H03L 500
Patent
active
060378239
ABSTRACT:
A current to voltage conversion circuit is formed of a differential amplifier circuit (1) with a negative input terminal connected to a light receiving element (3) and a register (4) which feeds back an output signal to the negative input terminal of the differential amplifier circuit (1) thereof. The variable gain amplifier circuit (5) amplifies the output voltage of the current to voltage conversion circuit to detect the bottom value of the output signal thereof. The comparator circuit (7) compares the bottom value with the reference value Vr1 so that current flowing through the resistor (4) can be adjusted according to the difference between the bottom value and the reference value Vr1. The offset of the output signal from the variable gain amplifier circuit (5) supplied through the output terminal OUT is thereby adjusted. Since the peak value of the output signal of the variable gain amplifier circuit (5) is detected and the gain of the variable gain amplifier circuit (5) is controlled according to the difference between the peak value and the reference value Vr2, an output signal of a predetermined level can be obtained.
REFERENCES:
patent: 4363977 (1982-12-01), Tsuda et al.
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 4975657 (1990-12-01), Eastmond
patent: 5539779 (1996-07-01), Nagahori
Arai Masashi
Nara Masaaki
Seyama Hiroki
Sanyo Electric Co,. Ltd.
Tran Toan
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