Trans-impedance amplifier with offset current

Details Trans-impedance amplifier with offset current Trans-impedance amplifier with offset current

2006-03-29

2008-01-15

Monbleau, Davienne N. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C330S308000, C327S514000, C250S2140RC

Reexamination Certificate

active

07319220

ABSTRACT:
A trans-impedance amplifier receives an input current and is operable to generate an output voltage responsive to the input current. The amplifier is responsive to an increased range of input currents and has a wide bandwidth. The amplifier includes an input stage having a first and a second transistor and is configured to receive the input current. The amplifier includes an output stage coupled to the input stage and having a third and a fourth transistor. A variable resistor is coupled to the output stage to adjust the amount of current in the output stage. A variable current source is coupled to the output stage and is operable to adjust the amount of current in the output stage. A output driver, which is coupled to the output stage, includes at least another transistor. The output driver is operable to provide the output voltage and is operable to reduce the output impedance of the amplifier.

REFERENCES:
patent: 2002/0140506 (2002-10-01), Kobayashi
patent: 2006/0197452 (2006-09-01), Zhang

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