Apparatus for measuring rf voltage from a quadrupole in a mass spectrometer
AssigneeDH Technologies Development Pte. Ltd.
InventorJohn Vandermey
Life of this patent
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Abstract
An apparatus for measuring RF voltage from a quadrupole in a mass spectrometer are provided. The apparatus comprises at least one rectifying diode circuit for rectifying the RF voltage of the quadrupole to produce a rectified RF voltage. The apparatus further comprises at least one operational amplifier configured as a current to voltage converter, a negative input of the at least one operational amplifier connected to the output of at least one diode in the at least one rectifying diode circuit, a positive input of the at least one operational amplifier at ground, and an output of the at least one operational amplifier in a feedback look with the negative input, to reduce reverse leakage current from the at least one diode.
Claims14
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.
A method for measuring RF voltage from a quadrupole in a mass spectrometer, comprising:
- providing a circuit 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;
- and
- measuring said RF voltage via said circuit.
Dependencies are inferred from the claim text.