Resources Contact Us Home
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
Autonomous primary-mirror synchronized reset
Improving alignment target contrast in a lithographic double patterning process
Packaging article
Method and apparatus for coordinating hopping of resources in wireless communication systems
Combination for composite layered chip package
Active pulse blood constituent monitoring
Fibrous laminate interface for security coatings
  Randomly Featured Patents
Structural member with a metal shell
Mouthpiece and speaker assemblies for underwater speech
Process and apparatus for generating power, producing fertilizer, and sequestering, carbon dioxide using renewable biomass
Spacecraft for removal of space orbital debris
Control device for indexing rotor on balancing machine
Wavelength division multiplexing combined with time division multiplexing using a common time reference
Frequency sensing device for reducing non-periodic components
Multi-position kinematic mount for optical sensors in stabilized platforms
Anti-biofilm carbonate compounds for use in oral care compositions
Measurement by concentration of a material within a structure