Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Low-noise sigma-delta analog-to-digital converter










Image Number 2 for United States Patent #6160506.

A sigma-delta analog-to-digital feedback converter arrangement (10) achieves low noise and a wide dynamic range by use of a directional coupler (18) as a summing device for generating the difference signal on which the forward sigma-delta analog-to-digital converter (32) operates. The feedback is provided by a digital-to-analog reconstructor (36), which applies the reconstructed analog signal to the tap (18.sub.3) of the directional coupler (18), in which the feedback signal is summed with the analog input signal. A low-noise amplifier (28) is coupled to the output of the directional coupler (18) at which the difference signal appears, so the dynamic range of the signal traversing the low-noise amplifier is small. The high isolation between the tap (18.sub.3) of the directional coupler (18) and the source of analog signals allows the use of an input bandpass filter (16).








 
 
  Recently Added Patents
Method of preparing enteric hard capsule and enteric hard capsule prepared thereby
Movable assemblies for an image reader unit and a cover unit in an image formation apparatus
Authoring method, authoring device and program
Touchscreen with Z-velocity enhancement
Light-emitting device with a spacer at bottom surface
Image processing apparatus and method having defective pixel detection and correction ability
Illuminating device
  Randomly Featured Patents
Controlling program and controlling method
Tire
Bottle insulator with integral bottle cap remover
Method of fabricating nozzle arrangements for an inkjet printhead chip
Poinsettia plant named `Fiscor Fire`
Semiconductor memory device and defective cell relieving method
Seismic float recovery system
Process of making a resin-composite panel
Vertical panning for interlaced video
Printing press having an anilox inking unit with an associated washing device