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
ZNF217 a new prognostic and predictive biomarker of recurrent invasive and metastatic phenotypes in breast cancer
Method and system for dynamic digital rights bundling
Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp
System, device and method for transrating file based assets
Dual source mass spectrometry system
Methods for diagnosing irritable bowel syndrome
Benzimidazole inhibition of biofilm formation
  Randomly Featured Patents
Supercritical pentane as an extractant for oil shale
Electric motor having an encapsulated stator for a vehicle braking device
Vacuum operated can-conveying and can-uprighting apparatus
Filter cage with removable filters
Pigment composition and aqueous pigment dispersion prepared therefrom
Ribbon drive assembly for ribbon cartridge
Process for manufacturing inorganic article
Device for detecting an abnormality of a rotation sensor