Constant current circuits
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United States of America Patent
Stats
-
Dec 29, 1987
Grant Date -
N/A
app pub date -
Nov 12, 1986
filing date -
Nov 12, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A constant current circuit includes a first constant current source including a transistor and a resistor, and a second source also including a resistor and a transistor which is controlled via a differential amplifier to produce a second constant current equal to the first. The differential amplifier has inputs connected to tapping points of similar potential dividers coupled between the current sources. The circuit is particularly applicable for supply d.c. sealing current via center-tapped transformer windings to the two balanced wire pairs of a four-wire transmission line.
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