Operational amplifier circuit having wide operating range

Details Operational amplifier circuit having wide operating range Operational amplifier circuit having wide operating range

1987-09-10

1988-08-23

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330257, 330258, H03F 345

Patent

active

047663944

ABSTRACT:
An operational amplifier circuit operable with a common-mode input voltage variable over a substantially full range between given source voltages, wherein complementary first and second differential transistor pairs each consisting of transistors having current input terminals connected together are arranged with current mirror circuits and constant-current source devices so that the first differential transistor pair is turned off and the second differential transistor pair operates as input devices for a load circuit when the common-mode input voltage approximates the lower source voltage. An increase in the common-mode input voltage causes the first differential transistor pair to turn on and gives rise to a decrease in the current flowing through the second differential transistor pair, in which instance the first differential transistor pair compensates for the reduction in the current through the second differential transistor pair by the action of the current mirror circuit associated with the two transistor pairs. The voltage applied to the load device is maintained constant without respect to the common-mode input voltage supplied to the differential transistor pairs so that there are no noises generated during transition of the common-mode input voltage through a certain voltage level.

REFERENCES:
patent: 4554515 (1985-11-01), Burson et al.

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