Resources Contact Us Home
Method and device for biasing a transistor of a radio frequency amplifier stage

Image Number 3 for United States Patent #6778019.

A biasing device includes closed-loop transconductance slaving circuit, able to slave the time average of the base/emitter or gate/source voltage of the amplifier transistor (Q1) to a reference voltage corresponding to a desired quiescent current for the transistor. Moreover, viewed from the base or gate of the amplifier transistor (Q1), the impedance of the base/emitter or gate/source circuit is small at low frequency, and large with respect to the impedance of the radio frequency source within the radio frequency range of the signal. The device can be incorporated in a mobile terminal, such as a cellular mobile phone.

  Recently Added Patents
Method and system for establishing security connection between switch equipments
Method, apparatus and article for detection of transponder tagged objects, for example during surgery
Optical angular position detection apparatus and method
Integrating map-reduce into a distributed relational database
Navigation apparatus, search result display method, and graphical user interface
Heat shield and laminated glass
Authentication platform and related method of operation
  Randomly Featured Patents
Intermediate component for an electrical connector and method of manufacture
LED control system
Multiple thermal annealing method for a metal oxide semiconductor field effect transistor with enhanced hot carrier effect (HCE) resistance
Multi-position remote controlling device for toys
Spot welding inspecting apparatus
Method and apparatus for compensating for dirt or etched areas on a document platen
Isotactic poly(glycidyl nitrate) and synthesis thereof
Locking adjustable speculum
Method for precipitation coating of internal surfaces in tanks and pipe systems
Chuck key