Resources Contact Us Home
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
Apparatus and method for noise removal by spectral smoothing
Method and system for quantifying viewer awareness of advertising images in a video source
Female urine funnel
Anti-slip strip for vehicle running boards
Vehicle running control system
Process for preparing MDA via the stage of the aminal
Knife grip
  Randomly Featured Patents
Intake system of a multi-cylinder internal combustion engine with exhaust gas recirculation
Use of surfactants with high molecular weight for improving the filterability in hydraulic lubricants
Hand-held printer with movement sensor
Circular saw with improved base plate adjustment
Hologram recording and reproduction apparatus
Control systems for generators
System and method of electron beam writing
Reduced complexity DMT/OFDM transceiver