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US 6,583,702 B2Granted
Quadrupole mass spectrometer driver with higher signal levels
AssigneeCalifornia Institute of Technology
InventorsAra Chutjian, Dean Aalami, Murray Darrach, Otto Orient
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Abstract
Driving a quadrapole mass spectrometer includes obtaining an air core transformer with a primary and a secondary, matching the secondary to the mass spectrometer, and driving the primary based on first and second voltage levels. Driving of the primary is via an isolating stage that minimizes low level drive signal coupling.
Claims3
A method of driving an air core transformer having a primary and a secondary, the method comprising:
- splitting a clock-generated output voltage signal into a plurality of out-of-phase voltage signals;
- applying each of the out-of-phase voltage signals differentially to transistors to produce an oscillating signal, wherein each transistor shares a common junction node and, wherein a negative voltage is applied to the transistors at the common junction node to increase a peak value of the signals seen by the respective transistors between the gate terminal and the common junction node of the transistors;
- and
- applying the oscillating signal to the primary.
1 more element
Dependencies are inferred from the claim text.