Reciprocal current circuit
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United States of America Patent
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-
Apr 6, 1982
Grant Date -
N/A
app pub date -
May 9, 1980
filing date -
May 9, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit is provided in which the output current is the inverse, that is, the reciprocal, of the input current. The circuit comprises an input current branch and an output current branch, each branch including the emitter-collector electrodes of one of matching transistors, and a reference current branch containing a pair of serially connected, like poled, diode-connected transistors. The base electrode of the input branch transistor is connected to a node in the reference branch on one side of both diode-connected transistors, and the emitter of the output branch transistor is connected to a node in the reference branch on the other side of both diode-connected transistors. The base of the output branch transistor is connected to a node in the input branch on the emitter side of the input branch transistor. The circuit thus represents sums and differences of various voltages across the PN junctions in the several branches. Since these voltages are proportional to the logarithms of the corresponding currents, the circuit produces a resultant relationship in which the output branch current is directly proportional to the square of the reference current and inversely proportional to the input branch current.
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