Comparator start-up arrangement

Details Comparator start-up arrangement Comparator start-up arrangement

1992-11-23

1994-08-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 327356, H03F 345

Patent

active

053390458

ABSTRACT:
A circuit including an operational amplifier (A) having an input stage comprising first and second transistors (10, 12) coupled in differential configuration and being powered by a first current source (20), the current source being powered by the output of the operational amplifier, wherein in order to ensure start up of the amplifier a second current source (34) is coupled to the differential pair of transistors, wherein a sensing means (40, 42) is provided responsive to the inputs of the operational amplifier and arranged to control energization of the second current source in order to switch off the second current source after switch on of the amplifier.

REFERENCES:
DeGrauwe et al., "CMOS Adaptive Biasing Amplifier", Conference: ESS Circ '81, Seventh European Solid-State Circuits Conference, Freiburg, Germany. Sep. 22-24, 1981.

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