Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-01-10
2006-01-10
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S157000
Reexamination Certificate
active
06985025
ABSTRACT:
There is disclosed control circuitry for adjusting a power supply level, VDD, of a digital processing component having varying operating frequencies. The control circuitry comprises N delay cells and power supply adjustment circuitry. The N delay cells are coupled in series, each of which has a delay D determined by a value of VDD, such that a clock edge applied to an input of a first delay cell ripples sequentially through the N delay cells. The power supply adjustment circuitry capable of adjusting VDD and is operable to (i) monitor outputs of at least a K delay cell and a K+1 delay cell, (ii) determine that the clock edge has reached an output of the K delay cell and has not reached an output of the K+1 delay cell, and (iii) generate a control signal capable of adjusting VDD in response thereto.
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Dhar Sandeep
Maksimovic Dragan
Cunningham Terry D.
National Semiconductor Corporation
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