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APPARATUS FOR MEASURING RF VOLTAGE FROM A QUADRUPOLE IN A MASS SPECTROMETER

  • US 20110084690A1
  • Filed: 10/07/2010
  • Published: 04/14/2011
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. An apparatus for measuring RF voltage from a quadrupole in a mass spectrometer, comprising:

  • at least one rectifying diode circuit for rectifying said RF voltage of said quadrupole to produce a rectified RF voltage; and

    at least one operational amplifier configured as a current to voltage converter, a negative input of said at least one operational amplifier connected to the output of at least one diode in said at least one rectifying diode circuit, a positive input of said at least one operational amplifier at ground, and an output of said at least one operational amplifier in a feedback look with said negative input, to reduce reverse leakage current from said at least one diode.

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