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
Hedge shear
Methods and apparatus for providing video on demand and network PVR functions using IP streaming
Method for repairing or replacing damaged tissue
Placental tissue grafts
Optical interconnect in high-speed memory systems
Digital rights management for media streams
Restarting event and alert analysis after a shutdown in a distributed processing system
  Randomly Featured Patents
Test method for phosphate coatings
Switch-mode AC-to-DC converter
Set of key buttons for a handset
Dynamic formation of groups in a notification system
Method and apparatus for refinement of learning in expert networks
NMR inhomogeneity compensation system
Semiconductor light emitting device with conductive window layer
Reverse optical mastering for data storage disk replicas
Overcurrent latch for magnetic contactor
Optical transmission system including optical repeaters with selectively enabled gain equalizers contained therein and including an add/drop apparatus with a plurality of individually selectab