APPARATUS FOR MEASURING RF VOLTAGE FROM A QUADRUPOLE IN A MASS SPECTROMETER
First Claim
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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Accused Products
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.
41 Citations
14 Claims
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1. An apparatus for measuring RF voltage from a quadrupole in a mass spectrometer, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for measuring RF voltage from a quadrupole in a mass spectrometer, comprising:
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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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification