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
Sign language keyboard and sign language searching apparatus using the same
Inverter, NAND gate, and NOR gate
Making transparent capacitor with multi-layer grid
Modified and stabilized GDF propeptides and uses thereof
Switched capacitor hold-up scheme for constant boost output voltage
Method of optimizing air mover performance characteristics to minimize temperature variations in a computing system enclosure
Display control device, display control method, and touchpad input system
  Randomly Featured Patents
Electronic printer
Propylene polymer compositions containing a propylene homo- or co-polymer obtained using a bridged metallocene catalyst and another propylene homo- or co-polymer
Mixing device
Multi-carrier communication apparatus, integrated circuit, multi-carrier communication system, and multi-carrier communication method
Crystallization seed-containing composition
Microstructured pattern inspection method
Methods of forming metal-containing films over surfaces of semiconductor substrates; and semiconductor constructions
Method and apparatus for controlling multiple light sources in a digital printer
Christmas stocking
Aqueous dispersion type thermosetting coating composition