Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Power amplifier control technique for enhanced efficiency










Image Number 2 for United States Patent #7193459.

A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier stage. The power control circuitry provides a variable supply voltage to the input amplifier stages based on an adjustable power control signal. The final amplifier stage is powered by a fixed supply voltage. In operation, as output power of the power amplifier is reduced from its highest power level, the variable supply voltage is reduced. Accordingly, RF power of an amplified signal provided to the final amplifier stage from the input amplifier stages decreases, and the final amplifier stage transitions from saturation to linear operation, thereby increasing the gain of the final amplifier stage. Thus, a desired output level can be maintained while operating at lower current levels.








 
 
  Recently Added Patents
Systems and methods for image stream processing
Vehicle running control system
Method and apparatus for laser strip splicing
Identifying conceptually related terms in search query results
Retrievable outgoing audio messaging
Load balancing for parallel tasks
Registration and network access control
  Randomly Featured Patents
Active-matrix substrate and display device including the substrate wherein a bottom-gate TFT has data lines formed below the gate lines
Process for producing 3-hydrazino-4-amino-5-mercapto-1,2,4-triazole
Image forming apparatus with detecting devices for image positioning on reversed sheet
Method and apparatus for providing professional liability coverage
Dome radiator speaker
Growth model automated material handling system
Metal-coated fiber compositions containing alloy barrier layer
Plastic filtration unit bonded by an L-shaped plastic melt
Wind power engine
Framework for a box kite