Resources Contact Us Home
Wireless frequency power amplifier, semiconductor device, and wireless frequency power amplification method

Image Number 12 for United States Patent #7683712.

A differential amplifier circuit is connected to the input node and the output node of the final amplification stage through detection circuits. The signal level difference output from the differential amplifier circuit does not change even if the input power varies. Because a change in the power gain at the output node does not travel back to the input node when the load impedance of the wireless frequency power amplifier varies, it is possible to detect only the change in the load impedance. Damage to the final stage can be prevented by controlling the operating current of the final stage and the gain of the drive stage according to the detected load variation. Nonlinear distortion in the wireless frequency power amplifier output can also be reduced by detecting and canceling the change in the gain of the drive stage by changing the gain of the adjustment stage.

  Recently Added Patents
Image processing apparatus, method for displaying interface screen, and computer-readable storage medium for computer program
Multi-partitioning of memories
Curable resin composition
Dual speed readout integrated circuit for high spatial and temporal resolution applications
Interface configuration system and method
Adaptive joint source channel coding
Method for solubilising, dispersing and stabilising of substances, products manufactured according to the method as well as the use thereof
  Randomly Featured Patents
Masking device for automobile vehicle headlights
Electrical gem box leveling template
Patch measurement device and printing apparatus incorporating the same
Control network-directed video conferencing switching system and method
Disk brake assembly with piston retraction seal
Impact absorber
Method of making resist patterns
Method and apparatus providing an imager module with a permanent carrier
Cocktail skewer holder
System for automatically preventing turnover of two wheeled vehicles