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
Mesa-shaped piezoelectric resonator element
Method of forming wafer level mold using glass fiber and wafer structure formed by the same
System and method for enhanced transaction payment
Image coding apparatus and image decoding apparatus
Resistor-2 resistor (R-2R) digital-to-analog converter with resistor network reversal
Configurable caged ball insert for a downhole tool
Charging seat having cleaning member
  Randomly Featured Patents
Large relative aperture telephoto lens system
Formation method of gate electrode in a semiconductor process
Holder for an x-ray sensing device
End cap assembly
Posi-action beavertail grip safety
Base station apparatus, mobile station apparatus, transmission method and receiving method in a CDMA/TDD mobile communication system
System and method for personalized search, information filtering, and for generating recommendations utilizing statistical latent class models
Crimping connector and method of producing the same
Ultrasonic method for measurement of size of any flaw within solid mass
Tuning control arrangement