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
Lithographic apparatus and device manufacturing method
Random access point (RAP) formation using intra refreshing technique in video coding
(4948
Acoustic echo cancellation
Methods of establishing virtual circuits and of providing a virtual private network service through a shared network, and provider edge device for such network
Emergency whistle, flashlight, and compass
Bi-directional switch using series connected N-type MOS devices in parallel with series connected P-type MOS devices
  Randomly Featured Patents
Method for the heat treatment of extended steel products
Coil end support for the stator winding of electric machines such as turbo generators or the like
Tomato stem and peel device and process
Switching arrangement in motor vehicles for the timed switching-on of inductive consuming devices
Austenitic stainless steel resistant to neutron-irradiation-induced deterioration and method of making thereof
Method and apparatus for data inversion in memory device
Assigning interrupts for input/output (I/O) devices among nodes of a non-uniform memory access (NUMA) system
Modulators of G protein-coupled receptor 88
Information processing apparatus, information processing system, and program
Microfluidic driving system