Resources Contact Us Home
High efficiency amplification

Image Number 8 for United States Patent #7482869.

A radio frequency amplification stage including an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, including a circuit for providing a reference signal representing the envelope of the input signal; a circuit for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and a circuit for generating an adjusted selected power supply voltage, including an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.

  Recently Added Patents
Control strategies for a multi-mode drive system
Architectural panel with bamboo rings heavy density embossed surface
Systems and methods for redox flow battery scalable modular reactant storage
CMOS image sensor
(Meth)acrylic resin composition, imidized (meth)acrylic resin composition, and film obtained by molding them
Recovering a database to any point-in-time in the past with guaranteed data consistency
Level-shift circuit, electro-optical device, and level shift method
  Randomly Featured Patents
Data synchronizing signal detector, signal processing device using the detector, information recording and reproducing apparatus having the detector and the device, data synchronizing signal d
Facsimile communication with a selective call system and method thereof
Nonconductive light guard
Sideless collapsible frame lampshade
Elevator door system having variable opening/closing width
Rotatable sign
Valve structure for damper
Variable display position expanded printing surface package
Substrate positioning device
System for securely transporting objects in a tamper-proof container, wherein at least one recipient station is mobile and portable