Negative inductance multiplier circuit including temperature compensation
First Claim
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1. An arrangement for correcting for transformer characteristics comprising in combination:
- a transformer including a magnetic core, a primary, a secondary and a tertiary winding thereon;
an impedance simulating network connected to said tertiary winding including feedback circuitry for establishing voltages and currents which affect said transformer as if a negative inductance having a magnitude proportional to the magnetizing inductance of said transformer, and a negative resistance having a magnitude proportional to the resistance of said tertiary winding; and
self adjusting positive resistance means, is series with said negative inductance, automatically adjustable to a magnitude to effectively cancel the negative resistance equivalent to the degree of increase in resistance of said tertiary winding.
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Abstract
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 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.
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Citations
5 Claims
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1. An arrangement for correcting for transformer characteristics comprising in combination:
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a transformer including a magnetic core, a primary, a secondary and a tertiary winding thereon; an impedance simulating network connected to said tertiary winding including feedback circuitry for establishing voltages and currents which affect said transformer as if a negative inductance having a magnitude proportional to the magnetizing inductance of said transformer, and a negative resistance having a magnitude proportional to the resistance of said tertiary winding; and self adjusting positive resistance means, is series with said negative inductance, automatically adjustable to a magnitude to effectively cancel the negative resistance equivalent to the degree of increase in resistance of said tertiary winding. - View Dependent Claims (2, 3, 4, 5)
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Specification