Slotted integrated circuit resistor

• US 4,774,492 A
• Filed: 12/03/1986
• Issued: 09/27/1988
• Est. Priority Date: 12/03/1986
• Status: Expired due to Term

• Current Assignee: VTC, Inc. (Synaptics Incorporated)
• Original Assignee: VTC, Inc. (Synaptics Incorporated)
• Inventors: Shier, John S.
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US06/937,565
• Time in Patent Office: 664 Days
• Field of Search: 338/306-309, 338/195, 338/203, 338/319, 338/320, 338/322, 338/327, 338/333-334, 219/121 LH, 219/121 LJ, 29/610 R, 29/620, 29/621, 29/619, 29/412-414
• US Class Current: 338/309
• CPC Class Codes: H01C 17/23 by opening or closing resistor geometric tracks of predetermined resistive values, e.g. snapistors

Abstract

A distributed wye resistor network fabricated on an integrated circuit substrate includes a resistive body coupled between two terminal elements. The resistive body includes a plurality of slots extending therethrough between the terminal elements to form a plurality of discrete resistive links. The resistive body therefore has characteristics of an artificial anisotropically conducting medium. The resistive links have a parabolic length profile. The links can be continuously cut, starting with the shortest link, until parameters of the integrated circuit are brought within desired specifications.

Claims

1. An artificial anisotropic resistor medium fabricated on a substrate in accordance with design constraints of a fabrication technology, including:

a substrate;

at least two terminal elements;

a resistive body fabricated on the substrate and coupling the terminal elements; and

a plurality of slots extending through the resistive body between the terminal elements to form a plurality of discrete resistive links coupled in parallel between the two terminal elements, wherein the slots have a width equal to a minimum width obtainable within the design constraints of the fabrication technology and the resistive links have a length profile which varies as a parabolic function.

2. The resistor of claim 1 wherein the slots have a maximum width of approximately three microns.

3. The resistor of claim 1 wherein the slots are parallel to one another.

4. The resistor of claim 1 wherein the slots extend across the entire resistive body between the terminal elements.

5. The resistor of claim 1 wherein the resistive links have a length profile which varies.

6. The resistor of claim 5 wherein the resistive links have a length profile which varies nonlinearly.

7. A distributed wye resistor network adapted for fabrication on a substrate utilizing a fabrication technology, including:

a substrate;

first and second terminals;

a first resistive body fabricated on the substrate and coupled to the first terminal;

a second resistive body fabricated on the substrate and coupled between the first resistive body and the second terminal; and

an artificial anisotropic resistive body fabricated on the substrate and coupled between the first resistive body and the second terminal, wherein the artificial anisotropic resistive body includes a plurality of slots having a width equal to a minimum width obtainable within design constraints of the fabrication technology, extending through the resistive body to form a plurality of discrete resistive links coupled to each other in an electrically parallel arrangement.

8. The resistor network of claim 7 wherein the slots in the anisotropic resistive body have a maximum width of approximately three microns.

9. The resistor network of claim 7 wherein the slots in the anisotropic resistive body are parallel to one another.

10. The resistor network of claim 7 wherein the slots in the anisotropic resistive body extend across the entire anisotropic resistive body.

11. The resistor network of claim 7 wherein the resistive links of the anisotropic resistive body have a length profile which varies.

12. The resistor network of claim 11 wherein the resistive links of the anisotropic resistive body have a length profile which varies nonlinearly.

13. The resistor network of claim 12 wherein the resistive links of the anisotropic resistive body have a length profile which varies as a parabolic function.

14. The resistor network of claim 7 and further including a fourth resistive body fabricated on the substrate and coupled between the first resistive body and the third resistive body.

15. The resistor network of claim 14, and further including a fifth resistive body fabricated on the substrate and coupled in parallel with the third resistive body.

16. An integrated circuit resistor, including:

a substrate;

at least two terminal elements;

a resistive body fabricated on the substrate and coupling the terminal elements; and

a plurality of slots having a maximum width of three microns extending through the resistive body between the terminal elements to form a plurality of discrete resistive links coupled in parallel between the two terminal elements.

17. The resistor of claim 16 wherein the slots are parallel to one another.

18. The resistor of claim 16 wherein the resistive links have a maximum width of six microns.

19. The resistor of claim 16 wherein the slots extend across the entire resistive body between the terminal elements.

20. The resistor of claim 16 wherein the resistive links have a parabolic length profile.

21. An integrated circuit resistor, including:

a substrate;

a pair of elongated terminal elements fabricated on the substrate;

a plurality of resistive links having a maximum width of six microns coupled between the terminal elements in an electrically parallel arrangement and spaced from one another by slots having a maximum width of three microns.

22. The resistor of claim 21 wherein a group of adjacent links from the plurality of links has a parabolic length profile.