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
Digital media content distribution
Method and apparatus for sharing virtual workspaces
Multistable electromagnetic actuators
Dynamic data filtering system and method
Nucleic acid sequences encoding strictosidine synthase proteins
Lens driving device
EpCAM as a reprogramming factor for non-pluripotent cells
  Randomly Featured Patents
Internal mandrel for use in pipe bending
Abdominal exercise apparatus for use in a pool
Photon energy activated radio frequency signal switch
System and method for photonic facility and line protection switching using wavelength translation
Hot melt adhesive applicator
Cabinet and undersink drawers
Acyl carrier protein-I/protein-A gene fusion, products and methods
.times.Taxodiomeria peizhongii tree named `Dongfangshan`
Lead-free solder alloy and a manufacturing process of electric and electronic apparatuses using such a lead-free solder alloy
Wine bottle rack