Light-receiving and amplifying device capable of switching betwe

Details Light-receiving and amplifying device capable of switching betwe Light-receiving and amplifying device capable of switching betwe

1994-06-08

1996-01-09

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

330282, 250214AG, H03F 308, H03G 312

Patent

active

054832004

ABSTRACT:
There is provided a light-receiving and amplifying device capable of changing its gain at high speed. A cathode of a photodiode PD is connected to a power source V.sub.CC via a current mirror circuit. An anode of the photodiode PD is connected to an input of an amplifier circuit AMP. The amplifier circuit AMP receives a photocurrent from the photodiode PD, converts the photocurrent into a voltage, and amplifies the voltage to form an output signal V.sub.OUT. A control signal of a current having the same magnitude as that of the photocurrent and output from the current mirror circuit is input to a control input terminal of a gain switching circuit. The gain switching circuit is composed of a resistor Rf.sub.1, a resistor Rf.sub.2, and a switch SW. The resistor Rf.sub.1 is connected across the input and the output of the amplifier circuit AMP, and the resistor Rf.sub.2 and the switch SW connected in series are connected across the input and the output of the amplifier circuit AMP.

REFERENCES:
patent: 4491800 (1985-01-01), Miyata
patent: 4673807 (1987-06-01), Kobayashi et al.
patent: 4757192 (1988-07-01), Oltmann

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