Front-end amplification circuit

Details Front-end amplification circuit Front-end amplification circuit

1999-02-24

2000-01-11

Pascal, Robert

Amplifiers

With semiconductor amplifying device

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

250214A, H03F 308, H01J 4014

Patent

active

060140615

ABSTRACT:
Output current of light receiving element Dph is converted into a voltage by a core amplification section, and the voltage output is extracted as an amplification output through an outputting circuit section. The output voltage is fed back to the base of transistor T2 of a differential circuit of the core amplification section, by which it is compared with base reference voltage Vref of transistor T1. When the input current is low, the gain of the core amplification section is dominated by the product of the current flowing through transistor T2 and resistor R4, but when the input current is high, the gain is dominated by the product of current flowing through transistor T1 and resistor R3. Consequently, if resistor R3 is set lower than resistor R4, then when the input current is high, the gain margin indicating a degree of stability of the feedback circuit can be made large, and this stabilizes operation of the front-end amplification circuit.

REFERENCES:
patent: 4563656 (1986-01-01), Baum
patent: 5525929 (1996-06-01), Nagahori et al.
patent: 5574404 (1996-11-01), Le Bars
patent: 5606277 (1997-02-01), Feliz

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