US5113366A
Expired / Lapsed
US
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Fuzzy membership function circuit
Assignee: S Aqua Semiconductor LLC
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Filing: 1989-03-14
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Granted: 1992-05-12
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Expires: 2009-03-14
Abstract
Abstract A programmable multi-membership function circuit comprises at least one or preferably two Z function circuits, at least one or preferably two S function circuits, and a fuzzy logic circuit for calculating fuzzy logic from the output of the Z function circuits and the output of the S function circuits. The fuzzy logic circuit comprises a MIN (intersection) circuit and a MAX (union) circuit, or the combination of these circuits.
Inventors
- 👤 Takeshi Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:51
CPC Classifications
G; G06; G06N; G06N7/00; G06N7/02; G06N7/04; G06N7/043; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A fuzzy membership Z function circuit comprising: a first current source for producing current of a value relative to a break point, a bounded-difference circuit for calculating a bounded difference by subtracting the output current of the first current source from an input current, a second current source for giving a current representing a specified grade in fuzzy logic, a subtraction circuit for subtracting the output current of the bounded-difference circuit from the output current of the second current source, and a diode function device for blocking a negative-direction current included in output currents from the subtraction circuit.
Claim 2
Dependent Claim
98 words
A fuzzy membership Z function circuit comprising: a first current source for producing current of a value relative to a break point, a bounded-difference circuit for calculating a bounded difference by subtracting the output current of the first current source from an input current, a second current source for giving a current representing a specified grade in fuzzy logic, a subtraction circuit for subtracting the output current of the bounded-difference circuit from the output current of the second current source, and a diode function device for blocking a negative-direction current included in output currents from the subtraction circuit.
Claim 3
Dependent Claim
13 words
A circuit as defined in claim 1 wherein the specified grade is 1.
Claim 4
Dependent Claim
37 words
A circuit as defined in claim 1 wherein the bounded-difference circuit includes a multi-output current mirror having output lines connected in parallel therewith, and a switching device is provided on at least one of the output lines.
Claim 5
Dependent Claim
98 words
A fuzzy membership S function circuit comprising: a first current source for producing current of a value relative to a break point, a bounded-difference circuit for calculating a bounded difference by subtracting an input current from the output current of the first current source, a second current source for producing a current representing a specified grade in fuzzy logic, a subtraction circuit for subtracting the output current of the bounded-difference circuit from the output current of the second current source, and a diode function device for blocking a negative-direction current included in output currents from the subtraction circuit.
Claim 6
Dependent Claim
98 words
A fuzzy membership S function circuit comprising: a first current source for producing current of a value relative to a break point, a bounded-difference circuit for calculating a bounded difference by subtracting an input current from the output current of the first current source, a second current source for producing a current representing a specified grade in fuzzy logic, a subtraction circuit for subtracting the output current of the bounded-difference circuit from the output current of the second current source, and a diode function device for blocking a negative-direction current included in output currents from the subtraction circuit.
Claim 7
Dependent Claim
13 words
A circuit as defined in claim 4 wherein the specified grade is 1.
Claim 8
Dependent Claim
37 words
A circuit as defined in claim 4 wherein the bounded-difference circuit includes a multi-output current mirror having output lines connected in parallel therewith, and a switching device is provided on at least one of the output lines.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |