Current sensing circuit with high input impedance

Details Current sensing circuit with high input impedance Current sensing circuit with high input impedance

1998-11-04

2000-06-06

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 67, 327 87, 327103, G01R 1900, G11C 700, H03F 345

Patent

active

060723394

ABSTRACT:
A current sensing circuit with high input impedance comprises a first transconductance amplifier connected across the terminals of a resistor, through which a current to be measured flows. A voltage amplifier is cascade-connected to the first transconductance amplifier. A second transconductance amplifier is feedback connected between an output of the voltage amplifier and a virtual ground node of the voltage amplifier. A ratio between the output voltage of the voltage amplifier and the voltage across the resistor are equal, in absolute value, to a ratio of the transconductances of the first and second transconductance amplifiers.

REFERENCES:
patent: 5606277 (1997-02-01), Feliz
patent: 5789973 (1998-08-01), Barrett, Jr. et al.
patent: 5844440 (1998-12-01), Lenk et al.

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