Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

1986-06-16

1987-03-10

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H03F 345

Patent

active

046493522

ABSTRACT:
An input portion (4, 6) of a differential amplifier circuit amplifies a differential input signal to produce an amplified signal between a pair of terminals. A summing section contains two complementary pairs of like-polarity amplifiers (13, 14 and 19, 20). Each has a first flow electrode, a second flow electrode, and a control electrode. A substantially constant bias voltage is supplied to the control electrodes of the first pair (13, 14) whose second electrodes are respectively coupled to the second electrodes of the second pair (19, 20). Their first electrodes are respectively coupled to the terminals and to corresponding impedance elements (11, 12). The control electrodes of the second pair are coupled together to receive a voltage dependent on the voltage at the second electrode of one (13) of the first pair so as to produce a representative output signal at the second electrode of the other (14) of the first pair.

REFERENCES:
patent: 4377789 (1983-03-01), Hoover
patent: 4463319 (1984-07-01), Kearney

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