Transimpedance amplifier with adjustable output amplitude...

Details Transimpedance amplifier with adjustable output amplitude... Transimpedance amplifier with adjustable output amplitude...

2005-03-08

2005-03-08

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

C330S098000

Reexamination Certificate

active

06864751

ABSTRACT:
A transimpedance amplifier circuit comprising transistors, a constant current source, a load resistor, and the feedback resistor with a shunt circuitry consisting of the additional transistors, which are driven for example with electrically adjustable voltage sources. In a bipolar npn implementation the amplifier stage consists of a common emitter input transistor Q1, a transistor Q2with its base connected to the collector of the first transistor operates as an emitter follower. A resistor RF connected between the emitter of said second transistor and the base of said first transistor provides a voltage controlled current feedback from the amplifier output to its input. The output voltage VOUT is generated at the emitter node of said second transistor. A shunt circuitry consists of a third and a fourth transistor Q3and Q4connected in shunt across resistor RF. In an embodiment, the base node voltages of the transistors Q3and Q4are adjusted by control voltage sources. By means of an appropriate implementation of these voltage sources the maximum and minimum limits of the output voltage VOUT is defined, which can easily be implemented with arbitrary temperature or supply voltage dependency.

REFERENCES:
patent: 5352992 (1994-10-01), Asazawa
patent: 5691670 (1997-11-01), Lohninger
patent: 6114913 (2000-09-01), Entrikin

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