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
Resist underlayer film forming composition for lithography, containing aromatic fused ring-containing resin
Mobile advertising and compensation-verification system
Pull through coronary sinus pacing lead
Electric vehicle supply equipment having a socket and a method of charging an electric vehicle
Magnetic element with top shield coupled side shield lamination
Method and apparatus for efficiently inserting fills in an integrated circuit layout
Enabling improvement in cellular network coverage
  Randomly Featured Patents
Synchronization and gain control circuit
ATM common part sub-layer device and method
Miniature rose plant `PACseventy`
Amelinic compounds
Sulfur-containing oxime compounds for protecting cultivated plants
Gemstone
Recording tape cartridge
Stirling cycle engine
Bamboo pull-out organizer
Multicast communication method using layer 2 and 3 switches