Adaptively biased differential operational amplifier for photo d

Details Adaptively biased differential operational amplifier for photo d Adaptively biased differential operational amplifier for photo d

1977-05-06

1978-05-30

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

250214A, 330 59, 330257, 330260, 354 60R, H03F 345, G03B 700

Patent

active

040926117

ABSTRACT:
A differential amplifier has one input connected to a reference potential and a photo diode connected in series with a level shift to the other input. A negative feedback loop is also coupled into other input. This stabilizes the amplifier and, if the level shift is made equal to the reference potential, biases the photo diode to zero, thereby reducing leakage current. A second feedback loop is used to adaptively bias the tail current in the differential amplifier.

REFERENCES:
patent: 3530378 (1970-09-01), Holle et al.
patent: 3641890 (1972-02-01), 0NO

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