Amplifier circuit

Details Amplifier circuit Amplifier circuit

1985-08-20

1986-03-25

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330311, 330277, H03F 316

Patent

active

045786470

ABSTRACT:
An amplifier includes a differential amplifier and an operational amplifier. An input signal is amplified by the differential amplifier and then fed to the operational amplifier which then delivers it after amplification. Part of the operational amplifier output is negatively fed back to one of inputs of the differential amplifier by a feedback element. Two differential amplifiers may be installed in the amplifier circuit, the first for amplifying the input signal and the second for amplifying an output of the first. The output of the second differential amplifier is fed to the operational amplifier, while part of an output of of the operational amplifier is negatively fed back to one of inputs of the second differential amplifier by a feedback element. The negative feedback cuts down the noise voltage of the whole amplifier circuit in terms of an input and increases the GB product.

REFERENCES:
patent: 3419809 (1968-12-01), Lach et al.
patent: 3530395 (1970-09-01), Prusha
patent: 4301421 (1981-11-01), Yokoyama

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