公开(公告)号：US3599081A

公开(公告)日：1971-08-10

申请号：US3599081D

申请日：1969-11-12

Applicant: ELECTRONIC ASSOCIATES

Inventor： BRYNDZA ROBERT M

IPC: G05F1/46 ,  H01J49/42 ,  G05F1/58 ,  G05F1/64

CPC classification number: H01J49/022 ,  G05F1/462 ,  H01J49/147

Abstract: A control circuit for an ionizer used in a quadrupole mass analyzer. The circuit relates the current supplied to the filaments (filament current) and the current output of the ionizer (emission current) such that when a desired emission current level is established, the circuit provides a filament current necessary to produce that emission current level. The emission current is sensed and compared with a reference level for this current in a comparator. The comparator output appropriately braces a current-regulating transistor in the filament supply as a function of the comparison.

公开(公告)号：US3621464A

公开(公告)日：1971-11-16

申请号：US3621464D

申请日：1969-11-20

Applicant: ELECTRONIC ASSOCIATES

Inventor： BRYNDZA ROBERT M ,  WIERSMA FONGER

IPC: H01J49/42 ,  H03L5/00 ,  H03B3/02

CPC classification number: H01J49/421 ,  H01J49/022 ,  H03L5/00

Abstract: An improved radio frequency (RF) generator for use with a quadrupole mass analyzer is disclosed wherein a ramp of RF at constant frequency is provided by developing a difference signal between the output of the circuit and a control ramp input. The error signal is modulated by the desired frequency supplied from an oscillator and amplified by a push-pull arrangement. The amplified signal is applied to a series resonant tuned circuit which directly supplies the quadrupole rods.