Amplifiers – Sum and difference amplifiers
Patent
1994-01-31
1996-05-07
Mottola, Steven
Amplifiers
Sum and difference amplifiers
324123C, 330 75, H03F 345, H03F 134, G01R 130
Patent
active
055150012
ABSTRACT:
An operational amplifier connected in series with a load and a current-measuring impedance and having at least two input ports and an output port, the output port of the operational amplifier further being directly connected to current-measuring impedance, with one of the input ports being coupled to the current input source to be measured, and the other input port being connected to a feedback loop coupled from the output side of the current-measuring impedance. The voltage across the current-measuring impedance which comprises a resistor is thereafter sensed, amplified and conditioned to provide a voltage which is proportional to the load current and accordingly a measure of the current input from the current source being measured. Such a current-measuring circuit can be used in connection with an inverter, a current-measuring amplifier, a current-measuring precision diode, a current integrator, and a current-measuring bridge.
REFERENCES:
patent: 3617881 (1971-11-01), McCormick
patent: 4551687 (1985-11-01), Lukens
patent: 4716378 (1987-12-01), Jiko et al.
patent: 5065088 (1991-11-01), Habiro et al.
patent: 5113143 (1992-05-01), Wei
patent: 5157288 (1992-10-01), Hill
patent: 5159277 (1992-10-01), Mount
Marchant Robert D.
Mottola Steven
The United States of America as represented by the United States
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