Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Power amplifier with controlled output power










Image Number 2 for United States Patent #7560989.

The invention includes a power amplifier with an amplifier core including parallel amplifier cells, a replica cell made of one amplifier cell similar to those of the amplifier core, a power controller to select a combination of amplifier cells to activate, a regulator to fix the top voltage of the replica cell to a reference voltage, a voltage generator to provide the voltage reference to the regulator, a current generator to provide a reference current through the replica cell, and a drive unit controlled by the regulator output to drive the combination of amplifier cells, so that each selected combination of activated cells defines a predetermined attenuation level of power amplifier output signal so that it is attenuated in a stepwise manner.








 
 
  Recently Added Patents
Methods of forming semiconductor devices having diffusion regions of reduced width
Mirror elements for EUV lithography and production methods therefor
Method and apparatus for power management control of an embedded memory having sleep and shutdown features
Low temperature pressure chamber unit, magnetic resonance device with a low temperature pressure chamber unit, and an attachment method to attach at least one add-on unit to an external housin
Information processing apparatus, information processing method, and program
Femtocell one-to-many packet delivery
Polarization preserving front projection screen microstructures
  Randomly Featured Patents
Cord stopper
Straight cup impactor with lever arm
Polymide nucleic acid derivatives, and agents and processes for preparing them
Vehicle carried manure removing machine
Log-likelihood ratio algorithm for use in reducing co-channel interference in wireless communication systems
Expandable shopping bag
Comb-line band-pass filters in the microwave field
Speech recognizing GIS/GPS/AVL system
Electronic device having a concealed battery latch door
Controlling solvent vapors in dry cleaning apparatus