Resources Contact Us Home
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
Vehicle location information-based abnormal driving determination and warning system
Method of adenoviral vector synthesis
Solid-state imaging apparatus, method of manufacturing solid-state imaging apparatus, and electronic apparatus
Systems and methods to provide communication history for communication devices
Implicit certificate scheme
Hot-press cushion material and manufacturing method of the same
  Randomly Featured Patents
Container cap with valve
Process for the production of iodophors
Structures formed from cellulose acetate, use thereof for the manufacture of filter tow, use of the filter tow for the manufacture of a tobacco smoke filter element, as well as a filter tow an
Gene therapy for muscular dystrophy
Molecular memory and method for making same
Gage head actuating coupler
Wireless transmission device and wireless receiving device
Systems and methods for printing multi-layer documents
Adhesive tape