Resources Contact Us Home
DC Current comparator circuit for generating an adjustable output proportional to an input signal

Image Number 5 for United States Patent #5225784.

A DC current-comparator-based circuit generates an adjustable output proportional to an input signal, i.e. an input voltage or current. One use of the circuit is in the formation of a DC resistance bridge that can be controlled automatically by a microprocessor. The ends of a pair of test resistors (the resistances of which are to be compared) are connected to respective ratio windings of the current comparator. The same potential is applied across these resistors by a master power supply. A microprocessor is alternately supplied with two voltage signals, a first being proportional to the current in a variable one of the ratio windings of the comparator, and the second being proportional to any inequality between the current in the other ratio winding and the test resistor to which it is connected. The microprocessor controls a slave power supply that receives both the first signal and a third signal that is indicative of any unbalance in the bridge. Balance is achieved by adjusting the variable ratio winding. Another use of the basic circuit is in the formation of an improved digital-to-analog converter, in which case the digital input controls the number of turns on the variable winding and the third signal provides the equivalent analog output.

  Recently Added Patents
Dihydronaphthyridinyl(organo)methanone analogs as positive allosteric mGluR5 modulators
Method for providing information of access point selection
System and method for improving text input in a shorthand-on-keyboard interface
Methods and systems for use in tracking targets for direction finding systems
Semiconductor device having a plurality of elements on one semiconductor substrate and method of manufacturing the same
Dye sensitised solar cell
Sub-LUN input/output profiling for SSD devices
  Randomly Featured Patents
Collision detecting apparatus for motor vehicles
Continuous flow cloverleaf type interchange
Ejection head for aggressive liquids manufactured by anodic bonding
Semiconductor device and method for manufacturing semiconductor device
Surge protection device
Screening assays for cancer chemopreventative agents
Front face of a vehicle wheel
Upgrading light olefin fuel gas in a fluidized bed catalyst reactor and regeneration of the catalyst
Precombustion chamber for a double overhead camshaft internal combustion engine
Monarda plant named `Pink Supreme`