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
Single check memory devices and methods
Method of transmitting data using spatial multiplexing
Secure data exchange for processing requests
MOS device for eliminating floating body effects and self-heating effects
Image forming apparatus having exhaust fan
Anthranilic diamide compositions for propagle coating
Packaging for socks
  Randomly Featured Patents
Axis control system for numerical control apparatus
Tamper indicator
Jewelry display device
Electromagnetic field intensity calculating method and apparatus
Malleable fiberoptic intubating stylet and method
Blue dyes for color filter array element
Photographic enlarging easel
Golf practice device
Method of forming lead-out electrode portion of photovoltaic device
Wicket bag packet