Differential amplifier

Details Differential amplifier Differential amplifier

1985-03-01

1986-09-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

H03F 345

Patent

active

046125132

ABSTRACT:
A first and a second transistor (T.sub.1, T.sub.2) whose emitters are connected to a common point (4) via first resistors (R.sub.1, R.sub.2), which common point is connected to the positive power-supply terminal via a current source (I.sub.1), form a differential amplifier to which an input signal (V.sub.i) is applied. In order to increase the slew rate the quiescent current through the first and the second transistor (T.sub.1, T.sub.2) is made to increase when the input voltage (V.sub.i) increases. This is achieved by means of a third transistor (T.sub.3) whose emitter is connected to the common point (4). The base of this transistor (T.sub.3) is connected to the tapping of a voltage divider which is arranged between the bases of the first and the second transistor (T.sub.1, T.sub.2) and which comprises second resistors (R.sub.3, R.sub.4). When the input voltage increases the transistor (T.sub.3) drains a continually decreasing portion of the current from the current source (I.sub.1).

REFERENCES:
patent: 4002993 (1977-01-01), van de Plassche
Hearn, "Fast Slewing Monolithic Operational Amplifier", IEEE Journal of Solid-State Circuits, vol. SC-6, No. 1, Feb. 1971, pp. 20-24.

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