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
Variable delay line for delay locked loop
Antenna device
Method and apparatus for user selection of advertising combinations
Providing a multi-tenant knowledge network
Sterilizable film for aseptic packaging
5-HT.sub.3 receptor modulators, methods of making, and use thereof
Switching device and electronic apparatus using the same
  Randomly Featured Patents
System of permanent magnets for an intense magnetic field
In-plane switching liquid crystal display device
Method for determining a value relating to compressing rate of a baler
Power amplifying method, power amplifier, and communication apparatus
Thread cutting tap retainer
Amorphous sulfide catalysts of trivalent chromium and promoter metals and method of making same
Capacitor structure
Activation plate for electroless and immersion plating of integrated circuits
Method for time-stamping messages
Digital dynamic trace adjustment pulse width modulate controller