Bootstrap power regulator for systems such as analog to digital

Details Bootstrap power regulator for systems such as analog to digital Bootstrap power regulator for systems such as analog to digital

1983-11-14

1985-04-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

330199, 330127, H03F 304

Patent

active

045118566

ABSTRACT:
A circuit for supplying regulated first and second supply voltages to the amplifier/comparator of a recirculation of remainder analog to digital converter, comprises a series pair of transistors connected as emitter followers between unregulated voltage sources. Outputs of the emitter followers carry the regulated supply voltages and are applied to the supply terminals of the amplifier/comparator. A pair of diodes connected in series between the bases of the emitter followers establish the magnitudes of the two regulated supply voltages. The junction voltage between the two Zener diodes is controlled by a difference amplifier that in turn is responsive to an analog input voltage and the output of the amplifier/comparator. The output of the difference amplifier causes the regulated supply voltages to track a common mode signal component inherent in the converter and thereby improves component accuracy. Another pair of Zener diodes between the output of the amplifier/comparator and the input to the difference amplifier prevents saturation of the amplifier/comparator by reducing the magnitude of the regulated supply voltages when the amplifier/comparator is in a comparator mode.

REFERENCES:
patent: 4378530 (1983-03-01), Garde

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