Claims
- 1. A circuit for applying RF and AC voltages to the electrodes of a RF inhomogeneous field device including:
an RF transformer having a primary winding, and a secondary winding coupled to said primary winding, said secondary winding having at least two electrically isolated filars upon which RF voltage couples substantially identically, and said secondary winding having a low RF voltage connection point and a high RF voltage connection point, a source of AC voltage connected between said at least two filars of the RF secondary windings at the low-voltage connection point of said RF winding, said filars supplying the combined RF and AC voltages to at least one electrode of the inhomogeneous RF field device.
- 2. A circuit as in claim 1, wherein said filars supply the combined RF and AC voltages to at least two electrodes.
- 3. A circuit as in claim 1, further comprising at least a first AC transformer connected between said at least two filars.
- 4. A circuit as in claim 3, wherein said AC transformer is connected to said filars at the low RF voltage connection point of the RF secondary winding.
- 5. A circuit as in claim 3, wherein said AC transformer is connected between said filars at the high voltage end of the RF transformer's secondary winding.
- 6. A circuit as in claim 4, further comprising at least a second AC transformer connected between said at least two filars at the high voltage end of the RF transformer's secondary winding.
- 7. A circuit as in claim 3 which includes at least one additional filar in the RF transformer secondary winding.
- 8. A circuit as in claim 7 in which an AC transformer is center tapped and the additional filar is connected to the center tap of said AC transformer.
- 9. A circuit as in claim 8 in which said additional filar is adapted to be connected to a DC voltage source.
- 10. A circuit as in claims 3, 4, 5 or 6 in which the broadband AC transformers are auto-transformers.
- 11. A circuit as in claim 6 in which said AC first broadband transformer has a primary winding for connection to a source of AC voltage and a secondary winding connected between said two filars and the second AC broadband transformer has a primary winding connected to said same two filars and a secondary winding connected to be adapted to said at least one electrode.
- 12. A circuit as in claim 1, wherein said two filars are driven with a differential source of AC.
- 13. A circuit as in claim 1, wherein said at least two filars are terminated with a low impedance.
- 14. A circuit as in claim 3, wherein the first AC transformer is center tapped and said center tap of said first AC transformer is connected to RF “ground”.
- 15. A circuit as in claim 14, wherein said center tap of said first AC transformer is bypassed to RF “ground” via a RF bypass capacitor.
- 16. A circuit as in claim 1, for use in trapping, guiding or manipulating ions.
- 17. A circuit for applying RF and AC voltages to a linear multipole device of the type having at least two pairs of opposing linear rod electrodes comprising:
a RF transformer having a primary winding adapted to be connected to a source of RF voltage, a secondary winding coupled to said primary windings, said secondary winding comprising a first section having at least two filars which have a low-voltage end and a high-voltage end, a second section having a low-voltage end connected to the low-voltage end of one of said filars, and a high-voltage end adapted to be connected to one pair of said electrodes to apply RF voltage thereto, and an AC transformer adapted to be connected to an AC voltage supply, and the output of said AC transformer coupled between two filars of the first section of said secondary winding of the RF transformer at the low-voltage end, the AC transformer supplying an AC voltage and an RF voltage across at least one of the other pair of electrodes.
- 18 A circuit as in claim 17, wherein said AC transformer is a broadband transformer.
- 19. A circuit as in claim 17, further comprising an output broadband transformer connected to the other end of said two filars of the first section of said secondary winding of the RF transformer.
- 20. A circuit as in claim 17 which includes at least one additional filar on the secondary windings of the first section of said secondary winding of the RF transformer.
- 21. A circuit as in claim 17 in which the AC transformer is center tapped and additional filar is connected to the center tap of said first AC transformer.
- 22. A circuit as in claim 17 or 18 in which the broadband transformers are auto-transformers.
- 23. A circuit as in claim 18 in which said first broadband transformer has a primary winding for connection to a source of AC voltage and a secondary winding connected between said two filars and the second broadband transformer has a primary connected to said same two filars and a secondary winding adapted to be connected to said pairs of electrodes.
- 24. A circuit for driving the electrodes of a quadrupole linear ion trap of the type having a center section and two end sections, each including two pairs of spaced electrodes comprising:
a RF transformer having a primary winding adapted to be connected to a source of RF voltage and center-tapped secondary windings coupled to said primary windings, said secondary windings comprising a first section having at least three filars having a low-voltage end and a high-voltage end, and a second section having at least three filars which have a low-voltage end connected to the low-voltage end of the first section and a high-voltage end, each filar adapted to be connected to one pair of each of said electrodes in each of said center and two end sections to apply RF voltage to said electrodes, a broadband transformer connected to apply AC voltage between two filars of the first winding section at the low-voltage end of said winding, an output broadband transformer with its primary connected to the high voltage end of said two filars, a third transformer, having a primary winding for receiving the output of said output broadband transformer, and three secondary windings, each one connected to one pair of the other spaced electrodes of each of said center and two end sections for applying RF and AC voltages thereto.
- 25. A circuit as in claim 24 in which said first sections and second sections include three additional filars with a different one of said filars adapted to connect to apply a different DC voltage to each pair of electrodes in each of said center sections and end sections.
- 26. A circuit as in claim 24 in which the additional filars are center tapped to connect to a different DC voltage.
- 27. A circuit for driving the electrodes of a quadrupole linear ion trap of the type having a center section and two end sections, each including two pairs of spaced electrodes comprising:
an RF transformer having a primary winding adapted to be connected to a source of RF voltage and center-tapped secondary windings coupled to said primary windings, said secondary windings comprising a first section having at least three filars having a low-voltage end and a high-voltage end, and a second section having at least three filars which have a low-voltage end connected to the low-voltage end of the first section and a high-voltage end, each filar adapted to be connected to one pair of each of said electrodes in each of said center and two end sections to apply RF voltage to said electrodes; a broadband transformer connected to apply AC voltage between two filars of he first winding section at the low-voltage end of said windings; and output broadband transformer means connected to the high voltage end of said two filars to apply RF and AC voltages to the other pair of each of said electrodes in each of said center and two end sections.
- 28. A circuit as in claim 24 in which said first sections and second sections include three filars with a different one of said filars adapted to connect to apply a different DC voltage to each pair of electrodes in each of said center sections and end sections.
RELATED APPLICATIONS
[0001] This application claims priority to provisional Application Serial No. 60/354,389 filed Feb. 4, 2002 and Serial No. 60/355,436 filed Feb. 5, 2002.
Provisional Applications (2)
|
Number |
Date |
Country |
|
60355436 |
Feb 2002 |
US |
|
60354389 |
Feb 2002 |
US |