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

Image Number 16 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
Illumination apparatus
Method of producing probabilities of being a template shape
Human and mouse targeting peptides identified by phage display
Secondary battery pack including insulative mounting member into which PCM is inserted in lateral direction
Communication apparatus, power supply control method, display apparatus, communication method, and computer program product
Scalable pixel coverage function-map
  Randomly Featured Patents
Clear channel assessment in wireless communications
Explosion protection system for a container
Lounge chair
Method for forming an optical fiber connector
Developing and analyzing a communication system
Multilayer printed wiring board and component mounting method thereof
Chair arm
Rotatably-mountable bumper and method for cushioning contact between a vehicle hood and grill
Applicator for applying a liquid cosmetic product and make-up assembly provided with such an applicator
Methods of identifying compounds that bind TANGO240