Resources Contact Us Home
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
Xylitol-based anti-mucosal compositions and related methods and compositions
Plants and seeds of corn variety CV335662
Nonvolatile semiconductor memory device and method for controlling the same
Large scale data storage system with fault tolerance
Managing and collaborating with digital content
Semiconductor memory apparatus
  Randomly Featured Patents
Network compromise recovery methods and apparatus
Four-way valve
Method and system of providing IP-based packet communications with in-premisis devices in a utility network
Alkyl-substituted thiapolycyclic polyahl and polyurethanes, polyamides and polyureas based thereon
Surface position sensor
Method of vertical display of wall paneling
Cross flow fan for air conditioner
Apparatus and methods for sanitizing sewage effluent and compositions for use therein
Weather strip for automobile and continuous extrusion molding system for molding same
Kit including substrates with various surface chemistries