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
Preamplifier-to-channel communication in a storage device
Method for producing vinyl acetate monomer
Machine tool with an electrical generator for passive power generation
High performance adaptive switched LED driver
Lightning-protective explosion-preventive fastener
Prompt gap varying optical filter, analytical instrument, optical device, and characteristic measurement method
Area reduction for surface mount package chips
  Randomly Featured Patents
Method of flameproofing cellulose fibers
Apparatus and method for distinguishing similar-sounding utterances speech recognition
Trim control
Catalyst and process for producing ethylene oxide
Human galactokinase gene
Catalytic hydrogen generator for use with methanol
(5R,6S,8R )-6-(1-hydroxyethyl)-2-(3R-pyrrolidin-2-one-3-yl)thiopenem-3-carboxylic acid
Cellular core structure building component
Cobalt aluminate internal colorants for diol bis (allyl carbonate)
Active pixel sensor cell that minimizes leakage current