Current limiting circuit and method that may be shared among dif

Details Current limiting circuit and method that may be shared among dif Current limiting circuit and method that may be shared among dif

1997-12-12

1999-12-14

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327108, 327423, 327588, H03K 508

Patent

active

060022884

ABSTRACT:
A circuit (10) and method for limiting output currents in a circuit having at least two output drivers (12,14) with outputs (16,18) on which first and second out-of-phase output currents are produced includes a current source (34) and a first current mirror (28). The first current mirror (28) has a first side (30) connected to sense a current in the output drivers and has a second side (32) connected to the current source (34). A magnitude of the current in the output drivers (12,14) produces a proportional voltage at a connection (52) between the second side (32) and the current source (34). First and second control transistors (40,42) are each connected to provide a control current to control respective output currents of the drivers (12,14), the first and second control transistors (40,42) being connected to receive an input signal (46) to pass the control current. A circuit (48) is provided for modifying the control current to the first and second control transistors (40,42) according to the proportional voltage.

REFERENCES:
patent: 4771228 (1988-09-01), Hester et al.
patent: 5191297 (1993-03-01), Penman et al.
patent: 5262713 (1993-11-01), Agiman
patent: 5386336 (1995-01-01), Kim et al.
patent: 5444409 (1995-08-01), Perraud
patent: 5451897 (1995-09-01), Komuro

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