Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2005-03-22
2005-03-22
Patel, Rajnikant B (Department: 2838)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S152000, C375S371000, C375S373000
Reexamination Certificate
active
06870410
ABSTRACT:
An all digital power supply system provides a supply voltage to semiconductor circuits. The power supply system utilizes an up/down counter and a pulse width modulator to output a signal into a LC network that generates the supply voltage. The width of the pulses output by the pulse width modulator are defined by an encoder that generates width information in response to a propagation delay detector that measures the propagation delay of a first clock signal when clocked by a second clock signal. The system supplies the optimum or minimum required voltage to insure that a critical path through a digital chip is met over process, voltage, and temperature (PVT) variations without the use of a band gap reference voltage source. A state machine is also used to counteract oscillations introduced by start up and load transients, thereby eliminating the need for a proportional integrator differentiator (PID).
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Doyle James Thomas
Kang Dae Woon
National Semiconductor Corporation
Patel Rajnikant B
Pickering Mark C.
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