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
VEGF-specific capture agents, compositions, and methods of using and making
Power storage device and method for manufacturing the same
Dielectric insulation medium
Sealed, waterproof digital electronic camera system and method of fabricating same
Over the counter medicinal container with surface ornamentation
Point-of-sale cart
Pattern forming method using developer containing organic solvent and rinsing solution for use in the pattern forming method
  Randomly Featured Patents
Simulator system for code execution and debugging within a multi-architecture environment
Separation of cresol from mares' urine
Heartbeat failure detector method and apparatus
FTP memory device programmable and erasable at cell level
Clutch actuating system
Method and apparatus for system monitoring and maintenance
Solid state storage device
Pharmaceutical preparation for treating blood coagulation disorders
Draper header with canvas to cutter bar seal
Head portion of a toothbrush