Differential type Class-AB second-order log-domain notch filter

KIRÇAY A., ÇAM U.

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, cilt.55, sa.5, ss.1203-1212, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 55 Sayı: 5
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1109/tcsi.2008.916458
  • Dergi Adı: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1203-1212
  • Anahtar Kelimeler: analog circuit, current-mode circuits, differential type Class-AB circuits, electronically tuned, log-domain filters, notch filters, state-space method, TRANSLINEAR CIRCUITS
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this paper, a new current-mode second-order differential type Class-AB log-domain notch filter is proposed. It is systematically designed using state-space synthesis method. The filter circuit is current-mode, Class-AB and differential type. In the circuit, the input and the output values, and dominant variables are all currents. Input and output currents are also differential signals. Only transistors and grounded capacitors are required to realize the filter circuit. Three cases of the second-order notch filter were obtained. The regular notch was obtained when omega(n) = omega(0), the low-pass notch was obtained when omega(n) > omega(0), and the high-pass notch was obtained when omega(n). < omega(0). The center frequency, the notch frequency, the quality factor, and gain of the filter can be electronically tuned by changing external currents. Time and frequency-domain simulations are performed using PSPICE program for the filter to verify the theory and to show the performance of it. For this purpose, the filter is simulated by using idealized bipolar junction transistor models and AT&T CBIC-R (NR200N-2X NPN), (PR200N-2X PNP) type transistors.