Current sources

Details Current sources Current sources

H - Electricity

03

F

330/22

H03F 3/45 (2006.01) G05F 1/56 (2006.01) H03F 1/08 (2006.01) H04M 1/60 (2006.01)

Patent

CA 1135349

-18- ABSTRACT Current Sources. A current source in which the output current from an output amplifier stage is controlled by an input signal, originating in a signal source, to an input amplifier stage incorporates, additionally to a negative feedback path from the output current path of the output stage to the input amplifier monitoring means in the signal input path to the output stage and control means in an input path to the input amplifier. The monitoring means monitors the current flow in the input path to the output stage and applies, via control means, a signal to the input amplifier such that the dependence of the current flow in the current output path on the gain of the output stage is reduced. A circuit is described, as well as an application to driving a telephone sub- scriber line and using two current sources working in push-pull mode.

316238

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