Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1993-08-18
1996-07-23
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 327345, H03B 100, H04B 110
Patent
active
055393543
ABSTRACT:
A circuit for an inductive current sensor that optimizes waveform fidelity of the inductively sensed current for non-sinusoidal currents is claimed. The circuit employs a high gain op amp to sum the inputs of a feedback capacitor and other feedback impedance components including a second op amp and a capacitor, the values of which are selected to provide a double pole roll-off with a gain peaking Q of between 1 and 10, and an impedance which at the low corner frequency is approximately equal to that of the feedback capacitor. Above the low corner frequency of the sensor, the impedance is sufficiently high to have substantially no effect on the circuit and which decreases below the low corner frequency.
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patent: 4470020 (1984-09-01), Mohr
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patent: 4591810 (1986-05-01), Mackenzie
patent: 4761605 (1988-08-01), Jochum
patent: 4980794 (1990-12-01), Engel
patent: 4984292 (1991-01-01), Millen
Johnson et al., "A Handbook of Active Filters," Prentice-Hall, Inc., 1980, pp. 93-95.
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