Comparator circuit with low current consumption

Details Comparator circuit with low current consumption Comparator circuit with low current consumption

1998-03-02

2000-05-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 70, 327103, 327563, 330261, H03K 522

Patent

active

060642408

ABSTRACT:
A comparator circuit with low current consumption for driving a sawtooth generator includes two differential amplifiers connected back to back, which control the bias current of an operational amplifier through a current measuring device and a means for impressing bias current. During normal operation, that is to say outside a switch-over point of the operational amplifier, the means for impressing bias current is supplied by a comparatively small standby current. Near the switch-over point of a sawtooth signal, the bias current of the operational amplifier is increased. Since the bias current source supplies a current pulse only at the switch-over point of the sawtooth signal, but remains switched off for the remainder of the time, the comparator circuit current consumption is minimized.

REFERENCES:
patent: 4338527 (1982-07-01), Nagano
patent: 4362956 (1982-12-01), Ogasawara et al.
patent: 4529891 (1985-07-01), Oida
patent: 4766394 (1988-08-01), Yukawa
patent: 4837523 (1989-06-01), Wright
patent: 5049761 (1991-09-01), Zitta
patent: 5311145 (1994-05-01), Huijsing et al.
patent: 5515005 (1996-05-01), Yoshioka
patent: 5774021 (1998-06-01), Szepesi et al.

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