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 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 Biosensor system based on recognition induced birefringence (RIB) Methods for plant transformation using spectinomycin selection Drug delivery from stents Targeting device IPv6 generation to trigger a virtual leased line service Arrangement comprising an electrical conductor track carrier and an optoelectronic component, and a method for producing such an arrangement Wellbore laser operations   Randomly Featured Patents Vessel and method of agitating a liquid Article storage facility Optical waveguides Underground water control system for tennis courts and the like Charging device with retractable charging plug Early auto-on mobile communications device Valve Playhouse Digital audio broadcasting system Cable end connector assembly with improved shielding means © 2006-2008 PatentGenius. All Rights Reserved.