Hall-effect device with current and hall-voltage connections

• US 5,646,527 A
• Filed: 12/01/1995
• Issued: 07/08/1997
• Est. Priority Date: 03/08/1993
• Status: Expired due to Term

• Current Assignee: Mani; R. G., Von Klitzing; K.
• Original Assignee: Mani; R. G., Von Klitzing; K.
• Inventors: von Klitzing, Klaus, Mani, Ramesh G.
• Primary Examiner(s): O'Shea, Sandra L.
• Assistant Examiner(s): PHILLIPS, ROGER
• Application Number:
  US08/513,899
• Time in Patent Office: 585 Days
• Field of Search: 324/207.2, 324/251, 338/32 H, 257/421, 257/425, 327/511
• US Class Current: 324/251
• CPC Class Codes: H10N 52/00 Hall-effect devices integrated devices or assemblies of multiple devices H10N59/00
• CPC Class Codes: H10N 52/101 Semiconductor Hall-effect devices

Abstract

A Hall effect device has a thin Hall element (10) having at least one hole or window and is bounded accordingly by at least one inner edge (10a, 10b) and, where required, also by an outer edge. One preferred embodiment having no current-induced misalignment voltages has a first pair of current connections (A,B) at two opposed locations on the outer edge (10a); a second pair of current connections (1,2) at two opposed locations on the inner edge (10b); at least one first pair of Hall voltage connections (C,E) at two opposed locations on the outer edge (10a) between the current connections (A,B) of the first pair; and/or at least one second pair of Hall voltage connections (3,5) at two opposed locations on the inner edge (10b) between the current connections (1,2) of the second pair. The currents (I_A,B, I₁,2) applied to the current connections may be dimensioned so that no misalignment voltages caused by internal voltage drops result at the Hall voltage connections.

Claims

1. A Hall effect device with at least one Hall element exhibiting a Hall voltage when subjected to a magnetic field having at least one component oriented vertically to the Hall element, said Hall element having a planar or platelike shape and being provided with current connections and Hall voltage connections, and at least one hole bounded by an inner edge in the plane perpendicular to the vertical magnetic field component with one of said connections arranged at said inner edge.

2. A Hall-effect device as set forth in claim 1, characterized in that at said inner edge (10b) at least one current connection (1 and/or 2) and at least one pair of Hall voltage connections (3,4;

5,6) are arranged.

3. A Hall-effect device (FIG. 1a) as set forth in claim 1, characterized by

a substantially C-shaped hole having an inner edge (10b) bounding a web-like region (10s) of said Hall element (10),

two current connections (1,2) of said web-like region (10s) and

at least two Hall voltage connections (3,14;

5,6) at said inner edge.

4. A Hall-effect device (FIG. 2) as set forth in claim 1, characterized in that

said Hall element (10) is additionally bounded by an outer edge (10a),

a first pair of current connections (A, B) is arranged at two opposed locations of said outer edge,

a second pair of current connections (1, 2) is arranged at two opposed locations of said inner edge,

at least a first pair of Hall voltage connections (3,5) is arranged at two opposed locations of said inner edge between the current connections (1,2) of said second pair.

5. A Hall-effect device as set forth in claim 4, characterized by

at least a second pair of Hall voltage connections (C,E) at two opposed locations of said outer edge (10a) between the current connections (A,B) of said first pair.

6. A Hall-effect device as set forth in claim 4, characterized in that a first current source (14;

16,R1) is coupled to the current connections (A,B) of said first pair and that a second current source (12;

16,R2) is coupled to the current connections (1,2) of said second pair, the polarities and magnitudes of the currents furnished by said current sources being dimensioned that misalignment voltages resulting due to a drop in voltage at said Hall element are reduced at said Hall voltage connections.

7. A Hall-effect device (FIG. 2) as set forth in claim 6, characterized in that the current sources (12, 14) are poled so that the current flows from a current connection, A at said outer edge (10a) to a neighboring current connection 1 at said inner edge (10b) and from a current connection (B) at said outer edge (10a) to a neighboring current connection (2) at said inner edge (10b).

8. A Hall-effect device (FIG. 6) as set forth in claim 6, characterized in that the current sources (16, R1, R2) are poled so that the current flows from neighboring current connections (1,A) of said first and second pair to the other neighboring current connections (B,2).

9. A Hall-effect device (FIG. 10b, FIG. 10c) as set forth in claim 1, characterized by

at least two holes, separated by a web-like region (20, 20a, 20b) of said Hall element,

two current connections (1a, 2a;

1b, 2b) at opposite sides of said web-like region, and

a current source (12c, 12d) coupled to said current connections.

10. A Hall-effect device as set forth in claim 9, characterized by a further current source (12a) arranged with current connections (A,B) at an outer edge of said Hall element.

11. A Hall-effect device as set forth in claim 9, characterized by a current source (12b) coupled to a first and to a second current connection (1,2) at the inner edge (10b2, 10b1) of a first and of a second hole.

12. A Hall-effect device (FIG. 11) as set forth in claim 2, characterized in that

said Hall element (10) has the shape of a frame bounded by an outer edge (10a) and by an inner edge (10b);

a pair of current connections (A1, 1a;

B1, 2a;

A2, 1b;

B2, 2b) is provided at each of several locations symmetrical with respect to said frame-shaped Hall elements at opposing locations of said outer and said inner edge and

at least one pair of Hall voltage connections (C, 3;

D, 4;

E, 5;

F,

     6) is provided spaced away from said current connections on said outer and inner edge.

13. A Hall-effect device (FIG. 12) as set forth in claim 1, characterized in that

said Hall element has at least one first hole bounded by a first inner edge (10b1) and at least one second hole bounded by a second inner edge (10b2);

a pair of current connections (1a1, 2a1) is arranged at at least one pair of opposed locations on said first inner edge;

a current source (12a, . . .) is connected between each pair of said current connections;

a pair of second current connections (1b1, 2b1) is arranged at at least two opposed locations on said second inner edge (10b2);

each pair of said second current connections is coupled to a current source (12d, . . .) and

at least one pair of Hall voltage connections (6,7) is provided at each inner edge.

14. A Hall-effect device as set forth in claim 13, characterized in that a further current source (12a) having two current connections (A,B) is coupled to an outer edge (10a) of said Hall element.

15. A Hall-effect device (FIG. 13) as set forth in claim 1, characterized in that

at least one hole is bounded by an E-shaped boundary (25) each end of which a current contact (1, 2a, 2b) is arranged;

said three current contacts are coupled to a current source arrangement (12a, 12b, 12c) having a source connection and two drain connections; and

at the inner edge of said hole at least one pair of Hall voltage connections is provided.

16. A Hall-effect device as set forth in claim 15, characterized in that at least one leg of said hole is divided by a web (28).

17. A Hall-effect device as set forth in claim 16, characterized in that at said web is short-circuited by a current source (12d).

18. A Hall-effect device (FIG. 15) as set forth in claim 1, characterized in that a three-terminal current source arrangement (12b, 12c, 12d) having three current connections (1, 2a, 2b) is coupled to the inner edge (10b) of at least one hole.

19. A Hall-effect device (FIG. 16, FIG. 17, FIG. 18) as set forth in claim 1, characterized in that a three-terminal current source arrangement is coupled via three current connections (A, Ba, Bb) to an outer edge (10a) of said Hall element.

20. A Hall-effect device (FIG. 21, FIG. 22, FIG. 23) as set forth in claim 1, characterized in that at least one pair of Hall voltage connections is short-circuited by a direct current conducting link.

21. A Hall-effect device (FIG. 24) as set forth in claim 1, characterized in that at least one Hall voltage connection of a pair is formed by a top (4) of a potentiometer (R), the ends of which are connected to two connections (5, 6) provided on one edge of said Hall element.

22. A Hall-effect device as set forth in claim 1, characterized in that said Hall element has an outer and an inner edge substantially spaced equidistance from each other.