Differential amplifier stage having bias compensating means

Details Differential amplifier stage having bias compensating means Differential amplifier stage having bias compensating means

1981-03-26

1984-01-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

044255519

ABSTRACT:
An improved amplifier of the type comprising bipolar transistor means coupled between the input terminal of the amplifier and a differential pair of transistors. Compensation means is provided for generating a compensating signal through the bipolar transistor means such that the bipolar transistor means and compensation means reduce the amount of bias current drawn from the input signal to the amplifier. Other aspects of the present invention include the provision of reducing DC offset voltages between each side of the differential amplifier due to the operation of the device with its input terminals at different voltage levels, and the provision of a zero in the transfer characteristics of the amplifier to mitigate the effects of poles provided in the transfer characteristics.

REFERENCES:
patent: 3551832 (1970-12-01), Graeme
patent: 3660773 (1972-05-01), Free
patent: 3887879 (1975-06-01), Radovsky
patent: 3916331 (1975-10-01), Schenck
patent: 4105942 (1978-08-01), Henry
patent: 4151483 (1979-04-01), Robe

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