Title :
Feasible designs for high order switched-current filters
Author :
Ng, Andrew E J ; Sewell, J.I.
Author_Institution :
Dept. of Electron. & Electr. Eng., Glasgow Univ., UK
Abstract :
Fully-balanced integrators based on S2I type memory cells are introduced for realising bilinear-LDI switched-current ladder filters. The problems of high component spreads and large silicon area encountered in very high order designs are overcome by adopting modified approximation and prototype ladder manipulation techniques, resulting in a typical example of a 21st order elliptic lowpass filter with a spread of 13.63. Modifications that allow for simplified input stages are also presented
Keywords :
active filters; elliptic filters; integrating circuits; ladder filters; low-pass filters; switched current circuits; IC area; S2I type memory cells; bilinear-LDI switched-current ladder filters; component spreads; elliptic lowpass filter; fully-balanced integrators; high order switched-current filters; input stages; ladder manipulation techniques; Active filters; CMOS process; Circuit simulation; Clocks; Crosstalk; Fabrication; Harmonic distortion; Passband; Prototypes; Silicon;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704172
