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 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
Simultaneous image distribution and archiving
Voltage detector having voltage detection printed board
Timing and cell specific system information handling for handover in evolved UTRA
Methods for processing 2Nx2N block with N being positive integer greater than four under intra-prediction mode and related processing circuits thereof
Location-based method to specify ratio frequency spectrum rights
Methods and apparatuses for anti-shading correction with extended color correlated temperature dependency
Methods and systems for creating a tail risk hedge index and trading derivative products based thereon
  Randomly Featured Patents
Dangler cable and method of securing an electical cable to a cathode member
Socket for burn-in tests
Shaft alignment data acquisition
Skin conduction and transport systems
Apparatus for the preparation of hollow plastic articles
Method for producing a substrate
Multi-station power supply with rotary switch for connecting two stations together
Apparatus and method for generating short optical pulses
Bore hole scanner with position detecting device and light polarizers
Electronic semiconductor device based on copper nickel and gallium-tin-zinc-copper-titanium p and n-type oxides, their applications and corresponding manufacture process