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
Multi-chip package with a supporting member and method of manufacturing the same
Semiconductor device
Markers of acute myeloid leukemia stem cells
Polarity switching member of dot inversion system
Wireless monitoring in process applications
Piezoelectric speaker and method of manufacturing the same
Image processing apparatus, image processing method, and program to create a composite image from color image data and monochrome image data
  Randomly Featured Patents
Blow plate and/or blow nozzle automatic cleaning device
Avoiding collisions between users if map containing persistent scheduling information is lost
Protection of oxide superconductors from degradation
Weather/proof padlock
Compounds having angiotensine II antagonistic activity
Differential pressure switch and sensor
Hybrid inflator with elongated housing and center discharge
Stacked trays convertible to open display cases
Ultrasonic fastening system and method
Insulated water impermeable roofing system