Current sense circuit

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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Details

327 51, 327427, G05F 110, H03K 17687

Patent

active

059007761

ABSTRACT:
A current sense circuit (100) for providing an output signal (Iout) representative of a current signal (Id) flowing through a FET output device (101) comprises a first transistor (102) for providing an image current signal (I.sub.m) which is substantially proportional to the current signal flowing through the FET output device (101) until the drain-source voltage signal of the FET output device (101) is less than a predetermined voltage and a second transistor (104) coupled to a control electrode of the first transistor (102) and for coupling to the gate electrode of the FET output device (101). The first (102) and second (104) transistors are matched and have the same threshold voltages as that of the FET output device (101). The second transistor (104) provides a correction current signal (I.sub.c) when the drain-source voltage signal of the FET output device (101) is less than the predetermined voltage. Subtracting circuitry (106) coupled to the first (102) and second (104) transistors subtracts the correction current signal (I.sub.c) from the image current signal (I.sub.m) to provide a corrected image current signal which is substantially proportional to the current signal flowing through the FET output device (101). The output signal (Iout) comprises the image current signal (I.sub.m) or corrected image current signal depending on the drain-source voltage of the FET output device (101).

REFERENCES:
patent: 4010425 (1977-03-01), Digwall et al.
patent: 4896121 (1990-01-01), Larson
patent: 5337021 (1994-08-01), Zarabadi et al.
patent: 5394079 (1995-02-01), Llewellyn
patent: 5525927 (1996-06-01), Yung et al.
patent: 5543745 (1996-08-01), Notani
patent: 5617056 (1997-04-01), Main et al.

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