A transmission line includes a signal conductor and at least one varactor diode capacitively coupled to the signal conductor. The transmission line's signal path delay is a function of its shunt capacitance, and the varactor's capacitance forms a part of the transmission line's shunt capacitance. Th
A transmission line includes a signal conductor and at least one varactor diode capacitively coupled to the signal conductor. The transmission line's signal path delay is a function of its shunt capacitance, and the varactor's capacitance forms a part of the transmission line's shunt capacitance. The transmission line's signal path delay is adjusted by adjusting a control voltage across the varactor diode thereby to adjust the varactor diode's capacitance.
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1. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor conveying the signal between the two points;a first varactor diode having a first variable capacitance; anda first coupli
1. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor conveying the signal between the two points;a first varactor diode having a first variable capacitance; anda first coupling conductor, the first varactor diode connected to the first coupling conductor, the first coupling conductor being positioned sufficiently near a portion of the signal conductor that an inherent first capacitance between the signal conductor and the first coupling conductor is sufficiently large to couple the first variable capacitance of the first varactor diode to the signal conductor and enable the variable capacitance to substantially influence a rate at which the signal conductor conveys the signal between two points;a second varactor diode having a second variable capacitance; anda second coupling conductor spaced from the first coupling conductor, the second coupling conductor being positioned sufficiently near a portion of the signal conductor that an inherent second capacitance between the signal conductor and the second coupling conductor is sufficiently large to couple the second variable capacitance of the second varactor diode to the signal conductor and enable the variable capacitance to substantially influence a rate at which the signal conductor conveys the signal between the two points,wherein an anode of the first varactor diode is connected to the first coupling conductor and a cathode of the second varactor diode is connected to the second coupling conductor. 2. The transmission line in accordance with claim 1 comprising a first voltage source for supplying a first adjustable voltage to the first coupling conductor for controlling the first variable capacitance of the first varactor diode. 3. The transmission line in accordance with claim 2 further comprising a second voltage source for supplying an adjustable second control voltage to the second coupling conductor for controlling the second variable capacitance of the second varactor diode. 4. The transmission line in accordance with claim 3 wherein the first and second control voltages are of opposite polarity. 5. The transmission line in accordance with claim 1, wherein the first coupling conductor comprises:a plurality of first conductive fingers, each being positioned near the signal conductor and spaced apart from one another such that each conductive finger provides a portion of the first coupling capacitance along a separate portion of the signal conductor; andmeans for conductively linking the conductive fingers to the first varactor diode, andwherein the second coupling conductor comprises:a plurality of second conductive fingers, each being positioned near the signal conductor and spaced apart from one another such that each conductive finger provides a portion of the second coupling capacitance along a separate portion of the signal conductor; andmeans for conductively linking the second conductive fingers to the second varactor diode. 6. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor for conveying the signal between the two points;first means having first variable capacitance that is a function of a magnitude of a first control voltage supplied as input thereto;first coupling means for providing a sufficient amount of first coupling capacitance between the first variable capacitance and the signal conductor such that the first variable capacitance substantially influences a rate at which the signal conductor conveys the signal between the two points;second means having second variable capacitance that is a function of a magnitude of a second control voltage supplied as input thereto; andsecond coupling means for providing a sufficient amount of second coupling capacitance between the second variable capacitance and the s ignal conductor such that the second capacitance substantially influences a rate at which the signal conductor conveys the signal between the two points,wherein the first means comprises a first varactor diode,wherein the second means comprises a second varactor diode,wherein the first coupling means comprises a first coupling conductor in electrical contact with the first varactor diode and positioned near the signal conductor such that the first coupling capacitance is provided between the first coupling conductor and the signal conductor,wherein the second coupling means comprises a second coupling conductor in electrical contact with the second varactor diode and positioned near the signal conductor such that the second coupling capacitance is provided between the second coupling conductor and the signal conductor,wherein the transmission line further comprises control means for generating the first control voltage on the first coupling conductor so that the first control voltage appears across the first varactor diode and for generating the second control voltage on the second coupling conductor so that the second control voltage appears across the second varactor diode,wherein the first and second control voltages are of opposite polarity,wherein the control means comprisesa first digital-to-analog converter (DAC) connected to the first coupling conductor, wherein the first DAC generates the first control voltage of magnitude controlled by first data applied as input to the first DAC;a second (DAC) connected to the second coupling conductor, wherein the second DAC generates the second control voltage of magnitude controlled by second data applied as input to the second DAC; andmeans for applying the first data as input to the first DAC and the second data as input to the second DAC. 7. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor for conveying the signal between the two points;first means having first variable capacitance that is a function of a magnitude of a first control voltage supplied as input thereto; andfirst coupling means for providing a sufficient amount of first coupling capacitance between the first variable capacitance and the signal conductor such that the first variable capacitance conveys the signal between the two points,wherein the first coupling conductor comprises:a plurality of conductive fingers, each being positioned near the signal conductor and spaced apart from one another such that each conductive finger provides a portion of the first coupling capacitance along a separate portion of the signal conductor, andmeans for conductively linking the conductive fingers to the first means. 8. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor for conveying the signal between the two points;first means having first variable capacitance that is a function of a magnitude of a first control voltage supplied as input thereto; andfirst coupling means for providing a sufficient amount of first coupling capacitance between the first variable capacitance and the signal conductor such that the first variable capacitance substantially influences a rate at which the signal conductor conveys the signal between the two points,wherein the signal conductor has an elongate first planar surface extending in a first direction;wherein the first coupling means comprises a conductive second planar surface parallel and proximate to a first area of the first planar surface; andwherein the transmission line further comprises an insulating substrate interconnecting the first area of the first planar surface to the second planar surface. 9. The transmission line in accordance with claim 8 wherein the first planar surface is of substantially uniform first width in a second direc tion perpendicular to the first direction in said first area and is of a substantially uniform second width in the second direction other than in the first area, wherein said first and second widths are substantially dissimilar. 10. The transmission line in accordance with claim 9 wherein the conductive second planar surface comprises:a plurality of conductive fingers, each being positioned near the first area of the first planar surface and spaced apart from one another such that each conductive finger provides a portion of the first coupling capacitance along a separate portion of the first area of the first planar surface, andmeans for conductively linking the conductive fingers to the first variable capacitance. 11. The transmission line in accordance with claim 10 wherein the first means comprises a first varactor diode. 12. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor for conveying the signal between the two points;first means having first variable capacitance that is a function of a magnitude of a first control voltage supplied as input thereto;first coupling means for providing a sufficient amount of first coupling capacitance between the first variable capacitance and the signal conductor such that the first variable capacitance substantially influences a rate at which the signal conductor conveys the signal between the two points,wherein the signal conductor has a substantially circular cross-section perpendicular to a direction in which it conveys the signal. 13. The transmission line in accordance with claim 12 wherein the signal conductor has a first outer surface, andwherein the transmission line further comprises first insulating material formed around the first outer surface of the signal conductor such that the first insulating material has a substantially circular cross-section perpendicular to the direction in which the signal conductor conveys the signal. 14. The transmission line in accordance with claim 13 wherein the first insulating material has a second outer surface and wherein the first coupling means comprises:a first conductive layer formed on the second outer surface, andmeans for conductively linking the first variable capacitance to the first conductive layer. 15. The transmission line in accordance with claim 14 wherein the first means comprises a first varactor diode. 16. The transmission line in accordance with claim 13wherein the first insulating material has a second outer surface,wherein the first coupling means comprises a first conductive layer formed on the second outer surface, andwherein the first means comprises a first thin film varactor diode formed on the second outer surface of the first conductive layer. 17. The transmission line in accordance with claim 16 further comprising:a second conductive layer covering the thin film varactor diode such that the thin film varactor diode resides between the first and second conductive layers, andmeans for coupling the second conductive layer to ground potential. 18. A transmission line providing a signal path for conveying a signal between two points with an adjustable signal path delay, the transmission line comprising:a signal conductor conveying the signal between the two points, wherein the signal conductor has a substantially circular cross-section perpendicular to a direction in which it conveys the signal;a first varactor diode having a first variable capacitance;a first coupling conductor, the first varactor diode connected to the first coupling conductor, the first coupling conductor being positioned sufficiently near a portion of the signal conductor that an inherent first capacitance between the signal conductor and the first coupling conductor is sufficiently large to couple the first variable capacitance of the first varactor diode to the signal conductor and enable the variable capacitance to subs tantially influence a rate at which the signal conductor conveys the signal between two points;a second varactor diode having a second variable capacitance; anda second coupling conductor spaced from the first coupling conductor, the second coupling conductor being positioned sufficiently near a portion of the signal conductor that an inherent second capacitance between the signal conductor and the second coupling conductor is sufficiently large to couple the second variable capacitance of the second varactor diode to the signal conductor and enable the variable capacitance to substantially influence a rate at which the signal conductor conveys the signal between the two points. 19. The transmission line in accordance with claim 18wherein the signal conductor has a first outer surface, andwherein the transmission line further comprises first insulating material formed around the first outer surface of the signal conductor such that the first insulating material has a substantially circular cross-section perpendicular to the direction in which the signal conductor conveys the signal. 20. The transmission line in accordance with claim 19wherein the first insulating material has a second outer surface,wherein the first coupling means comprises:a first conductive layer formed on the second outer surface, andmeans for conductively linking the first variable capacitance to the conductive layer, andwherein the second coupling means comprises:a second conductive layer formed on the second outer surface, andmeans for conductively linking the second variable capacitance to the conductive layer. 21. The transmission line in accordance with claim 20wherein the first means comprises a first varactor diode, andwherein the second means comprises a second varactor diode. 22. The transmission line in accordance with claim 19wherein the first insulating material has a second outer surface,wherein the first coupling means comprises a first conductive layer formed on the second outer surface,wherein the second coupling means comprises a second conductive layer formed on the second outer surface,wherein the first means comprises a first thin film varactor diode formed on the second outer surface of the first conductive layer, andwherein the second means comprises a second thin film varactor diode formed on the second outer surface of the second conductive layer. 23. The transmission line in accordance with claim 22 further comprising:a third conductive layer covering the first and second thin film varactor diodes such that the first thin film varactor diode links the first and third conductive layers and such that the second thin film varactor diode links the second and third conductive layers, andmeans for coupling the third conductive layer to ground potential. 24. The transmission line in accordance with claim 23 further comprising:control means for generating the first control voltage on the first conductive layer so that the first control voltage appears across the first thin film varactor diode and for generating the second control voltage on the second conductive layer so that the second control voltage appears across the second varactor diode.
Haill Harry K. (Houston TX) Birchak James R. (Spring TX) Hon Wai-Leung (Sugarland TX), Driver system and distributed transmission line network for driving devices under test.
Martel Anthony Paul ; McQuade Francis T., Impedance-matched interconnection device for connecting a vertical-pin integrated circuit probing device to integrated circuit test equipment.
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Gleason,K. Reed; Lesher,Tim; Strid,Eric W.; Andrews,Mike; Martin,John; Dunklee,John; Hayden,Leonard; Safwat,Amr M. E., Shielded probe for high-frequency testing of a device under test.
Gleason, K. Reed; Lesher, Tim; Strid, Eric W.; Andrews, Mike; Martin, John; Dunklee, John; Hayden, Leonard; Safwat, Amr M. E., Shielded probe for testing a device under test.
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Ding, Hanyi; Woods, Jr., Wayne H., Structure, structure and method for providing an on-chip variable delay transmission line with fixed characteristic impedance.
Ding, Hanyi; Woods, Jr., Wayne H., Structure, structure and method for providing an on-chip variable delay transmission line with fixed characteristic impedance.
Ding, Hanyi; Woods, Jr., Wayne H., Structure, structure and method for providing an on-chip variable delay transmission line with fixed characteristic impedance.
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