New very compact CMOS continuous-time low-voltage analog rank-order filter architecture

A new and very simple CMOS continuous-time analog rank-order filter architecture is presented. The hardware complexity grows linearly with the number of inputs at the rate of only two transistors per input. It is based on a multiple input differential structure. Rank is easily programmable with the tail current source for all rank order values from the max to the min case. The circuit has low voltage and power consumption requirements. Output buffered versions and techniques for reduction of corner errors are discussed. Experimental results are presented that verify the functionality and accuracy of the proposed circuit. Simulations show potential for operation in the 100 MHz range in 0.18 /spl mu/m CMOS technology.

[1]  Boon Poh Tan,et al.  Semiparallel rank order filtering in analog VLSI , 2001 .

[2]  Alejandro Díaz-Sánchez,et al.  Compact continuous-time analog rank-order filter implementation in CMOS technology , 2002, 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353).

[3]  Ugur Cilingiroglu,et al.  Rank-order filter design with a sampled-analog multiple-winners-take-all core , 2002 .

[4]  U. Cilingiroglu,et al.  Rank-order filter using multiple-winners-take-all , 2000, Proceedings of the 43rd IEEE Midwest Symposium on Circuits and Systems (Cat.No.CH37144).

[5]  Yusuf Leblebici,et al.  A Modular and Scalable Architecture for the Realization of High-speed Programmable Rank Order Filters Using Threshold Logic , 2000, VLSI Design.

[6]  K. Urahama,et al.  Direct analog rank filtering , 1995 .

[7]  Yusuf Leblebici,et al.  Realization of a programmable rank-order filter architecture using capacitive threshold logic gates , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).

[8]  Spyridon Vlassis,et al.  High-speed, accurate analogue CMOS rank filter , 2000 .

[9]  Stephen P. DeWeerth,et al.  Rank-order filtering in analog VLSI , 1996, 1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96.

[10]  I. E. Opris,et al.  Analog rank extractors , 1997 .