Very high speed integrated microelectronic tubes

• US 4,721,885 A
• Filed: 02/11/1987
• Issued: 01/26/1988
• Est. Priority Date: 02/11/1987
• Status: Expired due to Term

• Current Assignee: SRI International, Inc.
• Original Assignee: SRI International, Inc.
• Inventors: Brodie, Ivor
• Primary Examiner(s): DEMEO, PALMER
• Application Number:
  US07/013,560
• Time in Patent Office: 349 Days
• Field of Search: 313/336, 313/309, 313/606, 313/620, 313/351, 313/574, 313/575, 313/576, 313/584
• US Class Current: 313/576
• CPC Class Codes: H01J 1/3042 microengineered, e.g. Spindt-type
• CPC Class Codes: H01J 17/48 with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron

Abstract

An array of microelectronic tubes is shown which includes a plate-like substrate upon which an array of sharp needle-like cathode electrodes is located. Each tube in the array includes an anode electrode spaced from the cathode electrode. The tubes each contain gas at a pressure of between about 1/100 and 1 atmosphere, and the spacing between the tip of the cathode electrodes and anode electrodes is equal to or less than about 0.5 μm. The tubes are operated at voltages such that the mean free path of electrons travelling in the gas between the cathode and anode electrodes is equal to or greater than the spacing between the tip of the cathode electrode and the associated anode electrode. Both diode and triode arrays are shown.

Claims

1. An array of microelectronic tubes comprising a substrate,

an array of sharp needle-like cathode electrodes each with at least one tip carried by the substrate,

each tube including an anode electrode spaced from the tip of a cathode electrode for receiving electrons emitted by field emission from said cathode electrode,

insulating means separating and insulating said cathode electrodes from said anode electrodes, said insulating means including a plurality of through apertures into which the cathode electrodes extend,

each tube containing a gas at a pressure of between about 1/100 and 1 atmosphere, and

means for supplying operating voltages to the tubes whereby the mean free path of electrons travelling in said gas between said cathode and anode electrodes is equal to or greater than the spacing between the tip of the cathode electrode and the associated anode electrode and the maximum energy gained by the electrons is less than the ionization potential of the constituent gas.

2. An array of microelectronic tubes as defined in claim 1 wherein the interelectrode spacing between the cathode and anode electrodes of the tubes is ≦

about 0.5 μ

m.

3. An array of microelectronic tubes as defined in claim 1 wherein the gas comprises air.

4. An array of microelectronic tubes as defined in claim 1 wherein the gas comprises helium.

5. An array of microelectronic tubes as defined in claim 1 wherein the gas comprises neon.

6. An array of microelectronic tubes as defined in claim 1 wherein said substrate comprises a glass base with a layer of silicon thereon.

7. An array of microelectronic tubes as defined in claim 1 wherein said tubes comprise diodes, said array including rows of cathode connectors on the substrate connected to rows of said cathodes, and

said array including rows of anode electrodes extending in a direction at right angles to the direction of the rows of cathode connectors.

8. An array of microelectronic tubes as defined in claim 1 wherein each said tube includes a gate electrode having an aperture therethrough in alignment with an associated aperture in said insulating means and into which gate aperture the tip of the associated cathode electrode extends.

9. An array of microelectronic tubes as defined in claim 1 wherein at least one of the cathode and anode electrodes is applied to the array of tubes in the presence of gas of the type and pressure contained in the tubes.

10. An array of microelectronic tubes comprising a substrate,

an array of sharp needle-like cathode electrodes each with at least one tip formed on the substrate,

each tube including a gate electrode having an aperture therethrough into which aperture the tip of an associated cathode electrode extends,

insulating means separating and insulating said cathode electrodes from said gate electrodes, said insulating means including a plurality of through apertures in alignment with apertures in the gate electrodes,

each tube including an anode electrode spaced from said gate and cathode electrodes for receiving electrons emitted by field emission from said cathode electrodes,

each tube containing gas at a pressure of between about 1/100 and 1 atmosphere, and

means for supplying operating voltages to the tubes, whereby the mean free path of electrons travelling in said gas between said cathode and anode electrodes is equal to or greater than the spacing between the tip of the cathode electrode and the associated anode electrode and the maximum energy gained by the electrons is less than the ionization potential of the constituent gas.

11. An array of microelectronic tubes as defined in claim 10 wherein the interelectrode spacing between the cathode and anode electrodes of the tubes is ≦

about 0.5 μ

m.

12. An array of microelectronic tubes as defined in claim 10 wherein the gas comprises air.

13. An array of microelectronic tubes as defined in claim 10 wherein the gas comprises helium.

14. An array of microelectronic tubes as defined in claim 10 wherein the gas comprises neon.

15. An array of microelectronic tubes as defined in claim 10 including insulating means separating and insulating said gate and anode electrodes and having a plurality of through apertures in alignment with the gate electrode apertures.

16. An array of microelectronic tubes as defined in claim 15 wherein said anode electrodes comprise a unitary conductive member associated with a plurality of said tubes.

17. An array of microelectronic tubes as defined in claim 15 wherein gas contained in the tubes is supplied by application of said unitary conductive member to the insulating means that separates and insulates the gate and anode electrodes in the presence of gas at a pressure of between about 1/100 and 1 atmosphere.

18. An array of microelectronic tubes as defined in claim 10 wherein said substrate comprises a glass base with a layer of silicon thereon, upon which silicon layer said cathode electrodes are formed.

19. An array of microelectronic tubes as defined in claim 10 wherein said insulating means separating and insulating said cathode electrodes from said gate electrodes comprises a layer of SiO₂ formed on said silicon layer.

20. An array of microelectronic tubes as defined in claim 10 wherein at least one of the cathode and gate electrodes is applied to the array of tubes in the presence of gas of the type and pressure contained in the tubes.