Open AccessA Novel Log‐Domain First‐Order Multifunction Filter
Author(s) -
Kircay Ali,
Cam Ugur
Publication year - 2006
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.06.0205.0117
Subject(s) - filter (signal processing) , electronic engineering , block diagram , bandwidth (computing) , control theory (sociology) , engineering , topology (electrical circuits) , computer science , electrical engineering , telecommunications , control (management) , artificial intelligence
A new log‐domain first‐order multifunction filter is proposed in this letter. The proposed filter is systematically derived using the state‐space synthesis procedure from a corresponding block diagram. It provides low‐pass (LP), high‐pass (HP), and all‐pass (AP) responses simultaneously for a single input signal. The filter circuit has a very simple structure since it uses only bipolar junction transistors (BJTs) and a grounded capacitor. It can be electronically tuned by changing an external current. The filter has a greater bandwidth due to its inherent current‐mode and log‐domain operations. PSPICE simulations are given to confirm the theoretical analysis.