US 7,321,482 B2
Sub-circuit voltage manipulation
Don Douglas Josephson, Fort Collins, Colo. (US); and Samuel D. Naffziger, Fort Collins, Colo. (US)
Assigned to Hewlett-Packard Development Company, L.P., Houston, Tex. (US)
Filed on Mar. 19, 2004, as Appl. No. 10/804,624.
Prior Publication US 2005/0207076 A1, Sep. 22, 2005
Int. Cl. H02H 9/00 (2006.01); G01R 19/18 (2006.01); G01R 19/22 (2006.01)
U.S. Cl. 361—56  [324/118] 22 Claims
OG exemplary drawing
 
1. An integrated circuit comprising:
a first sub-circuit coupled to a first power supply rail providing a first power supply voltage;
a second sub-circuit coupled to a second power supply rail providing a second power supply voltage;
a first power supply modulator, coupled to the first sub-circuit and comprising a first plurality of shunts coupled to the first power supply rail, the modulator modulating the first power supply voltage without modulating the second power supply voltage; and
a first shunt controller, coupled to the at least one first shunt, comprising means for activating a predetermined subset of the first plurality of shunts.