Electronically and Orthogonally Tunable SITO Voltage-Mode Multifunction Biquad Filter Using LT1228s

Authors

  • May Phu Pwint Wai Department of Engineering Education, School of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand
  • Peerawut Suwanjan Department of Engineering Education, School of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand
  • Winai Jaikla Department of Engineering Education, School of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand https://orcid.org/0000-0003-1261-0917
  • Amornchai Chaichana Department of Engineering Education, School of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand

DOI:

https://doi.org/10.5755/j02.eie.28949

Keywords:

LT1228, Voltage-mode, SITO, Biquadratic filter, Active building block

Abstract

The commercially available IC LT1228 is an interesting active device due to its advantage features, such as a fast transconductance amplifier, a wide bandwidth over a wide range of voltage gain, low total harmonic distortion (THD), high impedance differential input, etc. The single-input triple-output (SITO) voltage-mode (VM) multifunction biquadratic filters using ICs, LT1228s are introduced in this research. This circuit design provides the three-filtering functions, low-pass (LP), high-pass (HP), and band-pass (BP), without changing the circuit architecture. It comprises three LT1228s, four resistors, and two capacitors connected to the ground. The low impedance voltage output nodes are HP and BP responses. The quality factor (Q) and the pole frequency (ω0) can be electronically and orthogonally tuned by altering the third LT1228’s bias current (IB). The PSPICE simulation and the experiment are verified to describe the circuit operation.

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Published

2021-09-08

How to Cite

Wai, M. P. P., Suwanjan, P., Jaikla, W., & Chaichana, A. (2021). Electronically and Orthogonally Tunable SITO Voltage-Mode Multifunction Biquad Filter Using LT1228s. Elektronika Ir Elektrotechnika, 1(1). https://doi.org/10.5755/j02.eie.28949

Issue

Section

ELECTRONICS