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
Coding circuitry for difference-based data transformation
Self assembly of elements for displays
System and method for performing image correction
Phosphor, light emitting apparatus, and liquid crystal display apparatus using the same
LED lighting module
Apparatus for providing location information of hand-held device and method thereof
Composite materials comprising aggregate and an elastomeric composition
  Randomly Featured Patents
Self-cooling beverage container with permeable wall
Light-emitting diode (LED)
Wafer surface measuring apparatus
TV Antenna
Container for pressure-tight dispensers and method for manufacture of the same
Agricultural machine
Crucible for growing single crystals, process for making the same and use of the same
Fuel vapor recovery control system
Method of producing a semiconductor component
Human-powered generator system with active inertia and simulated vehicle