Start-up circuit for negative inductance multiplier

Details Start-up circuit for negative inductance multiplier Start-up circuit for negative inductance multiplier

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 1201181

START-UP CIRCUIT FOR NEGATIVE INDUCTANCE MULTIPLIER 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 con- nected across a separate winding of the transformer to provide the reactive inductance. To compensate 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. An operational amplifier and diode are arranged to cooperate with the negative inductor to prevent lock-up.

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