Variable reference voltage generator

Details Variable reference voltage generator Variable reference voltage generator

1995-06-26

1996-11-19

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327538, G05F 110

Patent

active

055766579

ABSTRACT:
A variable reference voltage generator provides variable voltage rails for a delay element in order to control the amount of delay of an electrical signal through the delay element. A control signal, such as an error signal from a phase locked loop, is input to a pair of operational amplifiers, one configured as a unity gain buffer and the other configured as a positive gain feedback amplifier. The one amplifier is coupled to one input of a modified Magee inverter circuit and the other amplifier is coupled to the other input of the modified Magee inverter circuit. The variable voltage rails are taken from the output buffers of the modified Magee inverter circuit. To provide a range of voltages for the variable voltage rails that approaches the power supply voltages, the two outer transistors of the modified Magee inverter circuit are converted to voltage sources so that the control signal is added to the positive power supply voltage and subtracted from the negative power supply voltage.

REFERENCES:
patent: 4578600 (1986-03-01), Magee
patent: 4833350 (1989-05-01), Frisch
patent: 4922141 (1990-05-01), Lofgren et al.
patent: 5317254 (1994-05-01), Olson

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