Resources Contact Us Home
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
Capacitance sensing
Evaluating programmer efficiency in maintaining software systems
Method of enhancing corrosion resistance of hollow vessels
Fuel cell support structure
Cooling structure for electronic device
Fuel cell and a method of manufacturing a fuel cell
  Randomly Featured Patents
Method of making magnetic, crosslinked chitosan support materials and products thereof
Manufacturing method of substrate having conductive layer and manufacturing method of semiconductor device
Hockey training device
Method for sealing a leak in a pipe joint
Boiling point reactor with heat removal
Level shift semiconductor device
Image reading device capable of obtaining an accurate image
Ground fracturing probe
Variable intensity whistle