Apparatus and method for electronically driving a quadrupole...

Details Apparatus and method for electronically driving a quadrupole... Apparatus and method for electronically driving a quadrupole...

2006-07-18

2006-07-18

Berman, Jack I. (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000

Reexamination Certificate

active

07078686

ABSTRACT:
An apparatus for electronically controlling a quadrupole in a mass spectrometer, comprises radio frequency (RF) drive circuitry and direct current (DC) drive circuitry coupled to a quadrupole, an RF control loop associated with the RF drive circuitry, a DC control loop associated with the DC drive circuitry, and control loop circuitry associated with the DC control loop, the control loop circuitry configured to alter a response of the DC control loop during a settling time period of a step response such that ion transmission through the quadrupole is greater during the settling time than if the response of the DC control loop during the settling time is unaltered.

REFERENCES:
patent: 3735287 (1973-05-01), Lowe
patent: 3920986 (1975-11-01), Fies, Jr.
patent: 5463219 (1995-10-01), Buckley et al.
patent: 2 265 477 (1992-10-01), None
Copy of Search Report dated Oct. 4, 2005.

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