Resources Contact Us Home
Radio frequency bus leveling system

Image Number 7 for United States Patent #5546050.

A bus leveling system for automatically monitoring and maintaining the amplitude of a radio frequency (RF) signal carded on a bus. A two-stage variable gain amplifier (64) is connected in series with the bus. Each stage of the variable gain amplifier is constructed with a PIN diode (84, 86) in a feedback path of the stage. The amplification of the variable gain amplifier is varied by the injection of current into the feedback path to adjust the resistance of the PIN diodes. A control circuit having an RE detector (78) is provided to monitor and adjust the gain generated by the variable gain amplifier. Preferably, the control circuit and the variable gain amplifier are incorporated into an Application Specific Integrated Circuit (ASIC) (62). The RF detector is constructed of two Gilbert multipliers (202, 204) to minimize errors caused by operating condition changes, including variations in power supply voltage, temperature, or process.

  Recently Added Patents
System and method for burst separation and extended interleaving length
Semiconductor device
Frame syncrhonization in orthogonal frequency-division multiplexing systems
Agglutination judgment method
Collaborative system for capture and reuse of software application knowledge and a method of realizing same
Apparatus and method for scrolling a screen of a portable terminal having a touch screen
Coupling device having piercing member
  Randomly Featured Patents
Method of making alumina abrasive grain having a metal boride coating thereon
Supplemental vehicle heating apparatus with long heating cycle
Wireless IC device
Systems and methods for mapping and marking the thickness of bioprosthetic sheet
Method for measuring the mains frequency, and electrical appliance that implements said method
On-vehicle display device
Small line-size vortex meter
Method of calibrating ligand specificity
Tin steroids and their uses