Resources Contact Us Home
Photonic sigma delta analog-to-digital conversation employing dual heterojunction thyristors

Image Number 13 for United States Patent #7064697.

Interference caused by the propagation of a transmit signal transmitted from a transmit antenna to a receive antenna is effectively cancelled by an improved signal cancellation system. The system includes an interference cancellation signal generator that generates a time-delayed and amplitude-reduced representation of said transmit signal. A summing stage is operably coupled to the interference cancellation signal generator and the receive antenna. The summing stage subtracts the time-delayed and amplitude-reduced representation of the transmit signal from a receive signal to substantially cancel the interference. The interference cancellation signal generator preferably includes a novel programmable optical delay line that introduces a variable amount of optical delay to an optical signal derived from said transmit signal in addition to a thyristor-based sigma delta modulator that converts samples of the transmit signal to into a digital signal in the optical domain.

  Recently Added Patents
Semiconductor device and method of manufacturing the same
Switchable memory diodes based on ferroelectric/conjugated polymer heterostructures and/or their composites
Picture information coding device and coding method
Vehicle having power supply apparatus
Implantable device
Moving structure and micro-mirror device using the same
Mobile communication device
  Randomly Featured Patents
Focus controller and optical apparatus using the same
One-device random access memory cell having enhanced capacitance
Solid forms of selective androgen receptor modulators
Safety strap for securing a body harness to a scaffolding structure
Tool holding and displaying device
Electronic device for driving LED strings
Cartridge tray for use in a copying machine
Thermoplastic resin composition and method for preparing the same
Machine frame assemblies for scraper-chain conveyors