Fuzzy membership function generator using resonant tunneling diodes
US5572626A · kind A · utility
Inventors
Key dates
| Filing date | May 19, 1994 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | May 19, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S706/90
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
The folding V-I characteristic of a resonant tunneling diode (RTD) is utilized to generate the multiple membership functions for each antecedent. The folding characteristic of an RTD generally has a triangular shape, which corresponds to the popular membership function functions commonly in use. The amount of overlap of adjacent membership functions can be adjusted by adding or substracting a dc current to or from the RTD characteristic. The use of RTD folding characteristic to generate multiple membership functions can be used in a fuzzifier to simplify circuit implementation. A time varying membership function can be generated by sweeping the RTD with a voltage ramp. This time varying membership function can be used in the defuzzifier to obtain a crisp output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.