Current sensing circuit

Details Current sensing circuit Current sensing circuit

1996-07-22

1997-09-23

Hecker, Stuart N.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

361 18, G05F 304, H02H 700

Patent

active

056708670

ABSTRACT:
A current sensing circuit has an output NMOS transistor, connected between an output node and a power supply terminal, for passing a load current of an output load, a pair of sensing NMOS and PMOS transistors connected, in series at a first node, between the output node and the power supply terminal, a control section for supplying a common gate voltage to the transistors, and a voltage detecting section for detecting the potential at the first node. When the output transistor and sensing NMOS transistor are on, the sensing PMOS transistor is off. Accordingly, substantially no current flows through the sensing transistors so that power consumption for sensing operation is reduced. The output transistor is a vertical MOSFET while the sensing transistors are horizontal MOSFET integrated in a semiconductor circuit.

REFERENCES:
patent: 4021701 (1977-05-01), Davies
patent: 4355341 (1982-10-01), Kaplan
patent: 4553084 (1985-11-01), Wrathall
patent: 5559500 (1996-09-01), Kase
patent: 5587655 (1996-12-01), Oyabe et al.

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