Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2007-03-13
2007-03-13
Vu, Bao Q. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S274000, C323S284000, C323S283000
Reexamination Certificate
active
11068272
ABSTRACT:
A DC-to-DC converter as described herein is suitable for use as a variable voltage supply for an RF power amplifier. The DC-to-DC converter includes a buck converter for providing relatively low voltage and current output, and a linear voltage regulator for providing relatively high voltage and current output. When operating in a buck converter mode, the DC-to-DC converter disables the linear voltage regulator, thus providing efficient low-level operation. When operating in a linear regulator mode, the DC-to-DC converter enables the linear voltage regulator while maintaining at least some current flow through the buck converter; this is accomplished by keeping an output transistor of the buck converter continuously on during the linear regulator mode. The DC-to-DC converter can transition between operating modes in a smooth manner that does not result in discontinuous voltage drops.
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Chen Jau H.
Staudinger Joseph
Freescale Semiconductor Inc.
Ingrassia Fisher & Lorenz
Vu Bao Q.
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