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
Method for manufacturing and reoxidizing a TiN/Ta.sub.2O.sub.5/TiN capacitor
Acoustic measuring instrument
Hydrogen generation device and fuel cell system
Opioid-nornicotine codrugs combinations for pain management
Interactive program guide systems and processes
Efficient implementation of hash algorithm on a processor
Low cost mesh network capability
  Randomly Featured Patents
System for strictly positioning an object along an axis
Conversion boot upper
Liquid crystal display device
Pixels, display devices utilizing same, and pixel driving methods
Method and apparatus for advertising services of two network servers from a single network node
Configurable recovery of aborted session data
Ballistic vest
Quick coupler for removably joining two pipes
System and method for streaming multimedia over packet networks
Fabric cleaning formulations