Low power consumption switch interface circuit

Details Low power consumption switch interface circuit Low power consumption switch interface circuit

1996-02-01

1998-03-17

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Generating sawtooth or triangular output

327108, 327135, 307137, 3071414, A01H 160

Patent

active

057291675

ABSTRACT:
A low power consumption switch interface circuit (100) includes a current source (109) for providing switch current (144) having a magnitude dependent on a state of a current range signal (135). An input terminal (142) is provided to conduct the switch current (144) to an external switch (102). A circuit (101, 103, 119) for detecting a signal (141) present at the input terminal (142) provides a measured pulse (127) when the signal (141) is detected. A current range selector (129), coupled to the current source (109), outputs a first state of the current range signal (135) while the measured pulse (127) is outputted from the circuit (101, 103, 119), and a second state of the current range signal (135) while the measured pulse (127) is not outputted from the circuit (101, 103, 119). The current source (109) provides the switch current (144) at a first magnitude responsive to the first state of the current range signal (135), and a second magnitude responsive to the second state of the current range signal (135).

REFERENCES:
patent: 3794850 (1974-02-01), Hirose
patent: 4975598 (1990-12-01), Borkar
patent: 5258654 (1993-11-01), Roberts et al.
patent: 5289051 (1994-02-01), Zitta
patent: 5523633 (1996-06-01), Imaizumi et al.

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