Non-intrusive current measuring circuit

Details Non-intrusive current measuring circuit Non-intrusive current measuring circuit

1989-03-06

1990-03-20

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With amplifier or space discharge device

324 99R, 324103P, 307359, 307362, G01R 1900, G01R 1920

Patent

active

049104551

ABSTRACT:
A current measuring circuit for an integrated circuit comprises an operational amplifier (22), the non-inverting input terminal of which is grounded through a first resistor (23) having a value R.sub.B and a second resistor (21) having a value R.sub.2, the junction of those two resistors receiving the current (I.sub.NL) to be measured, and the output of which is connected by an inverter (26) to a MOS transistor (27). The biasing voltage of the operational amplifier and the characteristics of the inverter are chosen so that the MOS transistor is biased at its threshold in the absence of a current to be measured, whereby the output voltage V.sub.s is correlated with the current to be measured by a linear relation independent of the temperature.

REFERENCES:
patent: 3814957 (1974-06-01), Way
patent: 4281262 (1981-07-01), Dressen
patent: 4430618 (1984-02-01), Mitsueda et al.
patent: 4527076 (1985-07-01), Matsuo et al.
"MOSFET Measures Current with No Loss" by Frank Goodenough.

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