Current sources

Details Current sources Current sources

1979-07-10

1981-11-24

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 84, 330102, 330104, 330265, 307296R, H03F 345, H03F 134

Patent

active

043027261

ABSTRACT:
A current source in which the output current from an output amplifier stage (2) is controlled by an input signal, originating in a signal source (11), to an input amplifier stage (1) incorporates, additionally to a negative feedback path from the current input path of the output stage (2) to the input amplifier (1), monitoring means (5) in the signal input path to the output amplifier (2) and control means (4) in an input path to the input amplifier (1). Monitoring means (5) monitors the current flow in the input path to the output amplifier (2) and applies, via control means (4) a signal to the input amplifier (1) such that the dependence of the current flow in the current output path on the gain of the output stage (2) is reduced. A circuit is described, as well as an application to driving a telephone subscriber line and using two current sources working in push-pull mode.

REFERENCES:
patent: 3745477 (1973-07-01), Freeborn

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