Patent US3621464A successfully refreshed from Google Patents.
US3621464A
Expired / Lapsed
US
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Amplitude modulated rf generator for quadrupole mass analyzer
Assignee: Electronic Associates Inc
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Filing: 1969-11-20
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Granted: 1971-11-16
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Expires: 1989-11-20
Abstract
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.
Inventors
- 👤 Robert M Bryndza
- 👤 Fonger Wiersma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:27
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/42; H01J49/4205; H01J49/421; H01J49/02; H01J49/022; H03; H03L; H03L5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
A radiofrequency generator for supplying a variable amplitude radiofrequency electrical energy comprising: an oscillator for producing a constant frequency output signal; switch means connected to said oscillator and responsive to said output signal, said switch means being rendered alternately conductive and nonconductive at said frequency; first amplifier means connected to said switch means, a series resonant circuit connected to said amplifier for producing an output voltage having a magnitude dependent upon the output of said first amplifier, detector means connected to said tuned circuit for producing an electrical signal representing said output voltage; means for producing a ramp voltage; differential amplifier means having a first input connected to receive said ramp voltage and a second input connected to said detector means for producing an output signal representing the amplitude difference between said ramp and said output voltage; means including second amplifier means connected to said differential amplifier and to said switch means for applying said difference signal to said switch means and said first amplifier means whereby the magnitude of said resonant circuit output voltage is a function of said difference signal at said oscillator frequency.
Claim 2
Dependent Claim
186 words
A radiofrequency generator for supplying a variable amplitude radiofrequency electrical energy comprising: an oscillator for producing a constant frequency output signal; switch means connected to said oscillator and responsive to said output signal, said switch means being rendered alternately conductive and nonconductive at said frequency; first amplifier means connected to said switch means, a series resonant circuit connected to said amplifier for producing an output voltage having a magnitude dependent upon the output of said first amplifier, detector means connected to said tuned circuit for producing an electrical signal representing said output voltage; means for producing a ramp voltage; differential amplifier means having a first input connected to receive said ramp voltage and a second input connected to said detector means for producing an output signal representing the amplitude difference between said ramp and said output voltage; means including second amplifier means connected to said differential amplifier and to said switch means for applying said difference signal to said switch means and said first amplifier means whereby the magnitude of said resonant circuit output voltage is a function of said difference signal at said oscillator frequency.
Claim 3
Dependent Claim
127 words
A radiofrequency generator comprising: means for producing a control signal having a predetermined frequency, a resonant circuit for supplying a constant frequency output voltage having variable amplitude, means for producing a voltage having a predetermined amplitude change; means connected to said voltage producing means and to said resonant circuit for producing a difference signal representing the difference in amplitude between said variable amplitude radiofrequency voltage and said source; means including switch means connected to said control signal producing means; to said resonant circuit; and to said difference signal producing means for selectively applying said difference signal to said resonant circuit at said predetermined frequency; whereby the frequency of said output voltage is said predetermined frequency and the amplitude of said output voltage tracks said predetermined amplitude change.
Claim 4
Dependent Claim
127 words
A radiofrequency generator comprising: means for producing a control signal having a predetermined frequency, a resonant circuit for supplying a constant frequency output voltage having variable amplitude, means for producing a voltage having a predetermined amplitude change; means connected to said voltage producing means and to said resonant circuit for producing a difference signal representing the difference in amplitude between said variable amplitude radiofrequency voltage and said source; means including switch means connected to said control signal producing means; to said resonant circuit; and to said difference signal producing means for selectively applying said difference signal to said resonant circuit at said predetermined frequency; whereby the frequency of said output voltage is said predetermined frequency and the amplitude of said output voltage tracks said predetermined amplitude change.
References Cited (Backward Citations)
US3410998A
Cited
US3495186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |