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
Resin composition and display device using the same
Input device with photodetector pairs
Memory device and method for dynamic random access memory having serial interface and integral instruction buffer
Image processing apparatus and image processing method
Quantitative sleep analysis system and method
Reserving a time block in a calendar application to account for a travel time between geographic locations of appointments
  Randomly Featured Patents
Personal calendaring, schedules, and notification using directory data
Motor vehicle with an additional crawler undercarriage
Thermal barrier coating system having a top coat with a graded interface
Temperature sensing device
Zeroing circuit
Techniques for reducing power requirements of an integrated circuit
Combined container cap and holder for lighter refill adapters
5-Fluorouracil derivatives
Method of forming phosphosilicate glass having a high wet-etch rate