Resources Contact Us Home
Integrated Hall element and amplifier with controlled offset voltage

Image Number 4 for United States Patent #4709214.

An integrated circuit includes an epitaxial layer. In a near central region thereof is formed a symmetrical array of four equal sized Hall cells that are connected in parallel to form one Hall element. A moat surrounds the Hall element consisting of two concentric isolation walls separated by a band of opposite conductivity epitaxial material. The output of the Hall element is connected to the input of an adjacent differential amplifier that has two extraordinarily large amplifying transistors with emitter areas each equal to about a half of a Hall area, for achieving much better control over the relative dimensions of these emitters and thus over the amplifier offset voltage from chip to chip. The emitter resistors are likewise made very wide and both pairs of components are physically arranged to have balanced thermal coupling to the Hall element for further enhancing control of offset voltage.

  Recently Added Patents
Stabilized redispersible polymer powder compositions
Method and apparatus for providing spin-home function for mobile communication terminal
Synergistic preparations based on mixtures of glycerol ether with aromatic alcohol for controlling mycobacteria
Requirements model comparative analysis method for effort estimation in customizing a network monitoring and control system
Techniques for accessing a parallel database system via external programs using vertical and/or horizontal partitioning
Mineral, nutritional, cosmetic, pharmaceutical, and agricultural compositions and methods for producing the same
Field device for determining or monitoring a physical or chemical process variable
  Randomly Featured Patents
Circular stapler introducer with rigid distal end portion
Antiinflammatory gel preparation
Address space priority arbitration
Composite floor
Screening method and apparatus
Geranium plant named `Sandrine`
Fabric panel for coverings for architectural openings
Telescopic mascot
Necklace or similar article
Intercepting document data from a spooler and using the data to retrieve related information from a data base to modify the document