Servo loop for well bias voltage source

Details Servo loop for well bias voltage source Servo loop for well bias voltage source

2008-04-22

2008-04-22

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07362165

ABSTRACT:
A servo loop for a charge pump including comparator. A variable resistor and comparator are in series and couple the output of the charge pump to an enable input. A current source/sink coupled to the variable resistor provide a first input voltage to the comparator, with the second input of the comparator being coupled to ground or Vdd. A shunt circuit in parallel with the load at the output of the charge pump is also coupled to the output of the comparator. The charge pump and shunt are alternately enabled and disabled by the comparator to maintain a body-bias supply voltage. The servo loop may be configured to provide body-bias for NFETs or PFETs.

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