Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Stand for food service
Image capture and identification system and process
Method of treating cancer using a survivin inhibitor
Processes for producing polyunsaturated fatty acids in transgenic organisms
Systems and methods for identifying similar documents
Sealed, waterproof digital electronic camera system and method of fabricating same
Battery pack with interchangeable circuit substrates
  Randomly Featured Patents
Exercise apparatus
Transformation and regeneration of allium plants
Compact dual packer with locking dogs
Semiconductor storage device
System and method for communication between windowing environments
Folding mobile terminal device capable of receiving and transmitting sound while folded
Electron source, image-forming apparatus comprising the same and method of driving such an image-forming apparatus
Ultrasonic bone analysis device and method
Element organization support apparatus, element organization support method and storage medium
Override arrangement and actuating knob for a shifting mechanism in portable tools