A NEW CURRENT-MODE SQUARE-ROOT-DOMAIN GENERAL NOTCH FILTER

KIRÇAY A., Keserlioglu M. S., ÇAM U.

JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS, cilt.22, sa.1, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 22 Sayı: 1
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1142/s0218126612500727
  • Dergi Adı: JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Current-mode circuits, square-root-domain filters, notch filter, DESIGN
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this paper, a new current-mode second-order square-root-domain general notch filter is proposed. The design is based on the state-space synthesis method with two subcircuit; square-root and squarer/divider circuits. In the circuit, the input and the output values, and dominant variables are all currents. Only MOS 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(p), the lowpass notch was obtained when omega(n) > omega(p), and the highpass notch was obtained when omega(n) < omega(p). The center frequency, and the notch frequency 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 TSMC 0.35 mu m Level 3 CMOS process parameters.