Resources Contact Us Home
Quadrature signal conversion device

Image Number 4 for United States Patent #5764171.

A receiver including two sigma delta modulators used to convert a pair of analog quadrature signals into digital quadrature signals. In such sigma delta modulators the quantization noise is shifted into a frequency region in which no signal is present. A cross coupling between the filters is provided to improve the noise reduction without increasing the order of the filters. By providing the cross coupling, it is possible to obtain complex poles and zeros in the noise transfer function which do not have to appear in complex conjugate pairs which results in an increase of the noise suppression in a specified frequency range.

  Recently Added Patents
Device and implantation system for electrical stimulation of biological systems
Therapeutic vitamin D sun-protecting formulations and methods for their use
Method for dropping packet data, radio communication device, and mobile communication system
Fan guide
Cryptography on a simplified elliptical curve
Cascode circuit device with improved reverse recovery characteristic
Curable sublimation marking material and sublimation transfer process using same
  Randomly Featured Patents
Computer with integrated display and keyboard
Fluid dispenser lock defeater
Portable chair and cane with umbrella
Curtain holder
Elbow lever sheet metal cutting press consisting of a press frame and a press ram
Transformational conversation definition language
Configurable delay chain with stacked inverter delay elements
Agricultural phosphorus-containing sulfenamides
Process and solvate of 2-methyl-thieno-benzodiazepine