Title :
Ladder decompositions for wideband switched-current filter applications
Author :
Ng, A.E.J. ; Sewell, J.I.
Author_Institution :
Dept. of Electron. & Electr. Eng., Glasgow Univ., UK
Abstract :
Methods for designing switched-current ladder filters for wideband applications are presented. By performing UL-LU and LU-UL decompositions on the z-domain matrix description of a bilinear-transformed passive ladder, filter structures are derived which preserve low passband sensitivity even for large relative bandwidths. Derivation procedures are outlined and illustrated by the example of a 10th order LU-UL bandpass filter. The switched-current filters are realised using Euler-type integrators based on S3I cells. A comparison of the properties of different structures demonstrates the advantages of the UL-LU and LU-UL methods
Keywords :
active filters; band-pass filters; integrating circuits; ladder filters; switched current circuits; Euler-type integrators; LU-UL decompositions; S3I cells; UL-LU decompositions; bandpass filter; bilinear-transformed passive ladder; derivation procedures; ladder decompositions; passband sensitivity; wideband switched-current filter applications; z-domain matrix description; Admittance; Band pass filters; Bandwidth; Design methodology; Equations; Filtering; Matrix decomposition; Passband; Passive filters; Wideband;
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.1998.704202
