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Arrangement for improving the longterm stability of a Hall element

  • US 4,970,411 A
  • Filed: 04/19/1989
  • Issued: 11/13/1990
  • Est. Priority Date: 04/21/1988
  • Status: Expired due to Fees
First Claim
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1. A combination comprisinga magnetic field sensor, an output signal of said combination being proportional to an output signal of said magnetic field sensor,a semiconductor body, a portion of said semiconductor body containing said magnetic field sensor, said magnetic field sensor having a charge-carrier concentration and the output signal of said magnetic field sensor being inverse proportional to said charge-carrier concentration,a correction means comprising at least two electrical devices each having impedance value, at least one of said electrical devices being formed in a portion of said semiconductor body and an output signal of said correction means being proportional at least to a first power of a ratio of the impedance values of two of said electrical devices, andsaid correction means being electrically connected to said magnetic field sensor to provide an output signal of said combination which is substantially independent of variations of said charge-carrier concentration.

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