Differential transconductance circuit

Details Differential transconductance circuit Differential transconductance circuit

1989-05-16

1990-08-21

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330256, H03F 345

Patent

active

049510037

ABSTRACT:
A amplifier circuit comprises first transistor (T.sub.1) and a second transistor (T.sub.2) whose emitters are each connected via a first resistors (R.sub.1) to a point (2) which is connected to the power-supply terminal (3) by means of a current source (1). The bases of said transistors are connected to input terminals (4,5) and via a second resistor (R.sub.2) each to the base of a third transistor (T.sub.3) whose emitter is connected to the terminal (2). The linearity of the circuit is improved by arranging a fourth transistor (T.sub.4) and a fifth transistor (T.sub.5) in series with the collector-emitter paths of the first transistor (T.sub.1) and the second transistor (T.sub.2) which fourth and fifth transistor have their bases connected to a reference terminal (7) and have their emitters interconnected by means of a third resistor (R.sub.3).

REFERENCES:
patent: Re32479 (1987-08-01), Bohme
patent: 3489963 (1970-01-01), Gillett
patent: 4491803 (1985-01-01), Metz et al.
patent: 4612513 (1986-09-01), Seevinck
D. A. Nelson, "Get the Most Out of a Versatile Video Amplifier", Electronic Design, vol. 29, No. 6, Mar. 19, 1981, pp. 227-231.

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