Current-mode high output impedance multifunction filters employing minimum number of FTFNs


Cam U., CICEKOGLU O., Toker A. , KUNTMAN H.

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, cilt.28, ss.299-307, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 28 Konu: 3
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1023/a:1011212228758
  • Dergi Adı: ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
  • Sayfa Sayıları: ss.299-307

Özet

In this study, five current-mode FTFN-based multifunction filters are proposed, which realize the same transfer functions in ideal case. All circuits employ two capacitors and three resistors. For each circuit R-C:C-R transformation increases the number of realization possibilities to ten. The proposed topologies simultaneously realize three basic filtering functions using minimum number of FTFNs and provide high output impedances that enable easy cascading in current mode. Sensitivity analysis of the filters show that they have low passive sensitivities, omega (0), Q and omega (0)/Q of the filters are insensitive to current tracking errors, furthermore omega (0) of the filters are insensitive to voltage tracking errors of the FTFNs. The proposed circuits do not require component matching condition except for notch and allpass responses and permit independent adjustment of omega (0) without disturbing omega (0)/Q. Experimental and simulation results are given to verify the theoretical analyses.