Title :
Semi-parallel rank-order filtering in analog VLSI
Author :
Kalim, Ronald ; Wilson, Denise M.
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
Abstract :
This paper presents an implementation of semi-parallel rank-order filtering in analog VLSI to collect position-encoded rank data. The rank competition is based on voltage inputs and a popular winner-take-all (WTA) circuit. The input competition is performed in parallel and each rank is determined serially. Negative feedback ensures that neither the previous winner nor its nearest neighbors will compete in the new rank competition. This circuit is compact (21 transistors per input element), and can serve unlimited number of input elements. The 20 element array that we have fabricated and tested consumes approximately 0.2 mW of power, has good resolution (2 mV between inputs) and good response time (0.05 ms) in subthreshold operation
Keywords :
CMOS analogue integrated circuits; VLSI; analogue processing circuits; circuit feedback; signal processing equipment; 0.05 ms; 0.2 mW; WTA circuit; analog VLSI; negative feedback; position-encoded rank data; rank competition; semi-parallel rank-order filtering; sensor data processing; winner-take-all circuit; Chemical sensors; Clocks; Concurrent computing; Feedback circuits; Filtering; Robustness; Sensor arrays; Sorting; Very large scale integration; Voltage;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780676
