Balancing compensation in differential amplifiers with a single-

Details Balancing compensation in differential amplifiers with a single- Balancing compensation in differential amplifiers with a single-

1982-11-29

1985-05-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330292, H03F 114, H03F 345

Patent

active

045175250

ABSTRACT:
A differential amplifier with single-ended drive includes a balancing impedance (20) coupled between the base of the transistor (3) connected to the signal input (1) and the common point (9) of the two emitters of the transistors (3,4), which form a differential pair. The capacitance value of the capacitor (20) is substantially equal to the capacitance value of the stray capacitance (19) of the collector-substrate junction of a transistor (10) which forms a current source. This provides a symmetry of the capacitances between the input (1) and the common point (9) and between the common point (9) and ground via the transistor (10). This results in an improved balance in the output signals at the output terminals (5,6) and a flat frequency response of the differential amplifier for higher frequencies.

REFERENCES:
patent: 3292098 (1966-12-01), Bensing
patent: 4417216 (1983-11-01), Davis

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