Resources Contact Us Home
High frequency variable gain amplification device, control device, high frequency variable gain frequency-conversion device, and communication device

Image Number 11 for United States Patent #7245890.

A high frequency variable gain amplification device 100 includes: a feedback circuit 103 capable of changing a feedback impedance to adjust the gain of an amplifier 101 in accordance with a control signal from a control device 200; and a current consumption adjustment circuit 102 capable of adjusting current consumption of the amplifier 101. The control device 200 controls the feedback impedance and the current consumption based on a desired signal power level and an undesired signal power level. If the desired signal power level exceeds a predetermined value, the control device 200 reduces the feedback impedance to increase the amount of a feedback signal, thereby allowing the amplifier 101 to operate with low gain so as to prevent the distortion characteristic from being reduced and to reduce the current consumption.

  Recently Added Patents
Vacuum cleaner filter adapter ring
Using interrupted through-silicon-vias in integrated circuits adapted for stacking
Nonvolatile semiconductor memory device
Secure Flash-based memory system with fast wipe feature
Communication device and two-dimensional communication system using the same
Visual physician office systems and methods
  Randomly Featured Patents
Vacuum cleaner
Wall for the booth of a coating plant
Bag extraction device
Selectorized dumbbell having shock absorbing system comprising flexible and resilient rails in the weights
Blow molding process
Spray booth for applying coatings to a substrate and control device therefore
Preparation of zirconium oxychloride
Modified factor VIII and factor IX genes and vectors for gene therapy
Portable panels for a stage shell
Speed control of optical information reproducing apparatus based on storage quantity of a buffer memory during access operation