Low voltage current sense amplifier

Details Low voltage current sense amplifier Low voltage current sense amplifier

1998-06-04

1999-10-19

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330290, H03F 304

Patent

active

059695749

ABSTRACT:
An accurate, low voltage, low parts-count current sense amplifier can be employed to sense either high side or low side currents. A pair of transistors are connected in a common-base configuration and biased with equal currents, with a sense resistor connected between their respective emitter circuits. A sensed current develops a voltage across the sense resistor which unbalances the transistor currents. A third transistor is connected to provide a feedback current to detect and correct the current imbalance; the feedback current is directly proportional to the sensed current, and serves as the current sense amplifier's output. The current sense amplifier requires only three transistors, can be realized with bipolar or FET devices of either polarity, and can operate at supply voltages as low as about 1.1 volts.

REFERENCES:
patent: 2863957 (1958-12-01), Hamilton
patent: 5307027 (1994-04-01), Grasset
patent: 5451908 (1995-09-01), Bohme
patent: 5627494 (1997-05-01), Somerville et al.

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