Negative inductance multiplier circuit including temperature...

Details Negative inductance multiplier circuit including temperature... Negative inductance multiplier circuit including temperature...

H - Electricity

03

H

323/30, 333/83

H03H 11/00 (2006.01) H01F 27/42 (2006.01) H03H 11/54 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1201180

NEGATIVE INDUCTANCE MULTIPLIER CIRCUIT INCLUDING TEMPERATURE COMPENSATION ABSTRACT OF THE DISCLOSURE A circuit for increasing the inductance of a transformer as used in a telephone line circuit. An operational amplifier with appropriate feedback is connected across a separate winding of the trans- former to provide the reactive inductance. To com- pensate for changes in resistance of the winding, a field effect transistor is controlled by the same amplifier output to provide a positive resistance in the feedback path and thus maintain balance.

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