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.
Highlights
The realization of a continuous-time filter utilizing the electronically adjustable active building block (ABB) has been mainly focused on the research topic due to its advantages, e.g., it gives better adjustment than varying the value of the passive device
An electronically and orthogonally controllable single-input tripleoutput (SITO) VM multifunction biquadratic filtering circuit using LT1228 as an active building block is proposed in this paper
The capacitor C1 and the first LT1228 are constructed as the first lossless integrator, while the capacitor C2 and the second LT1228 are built as a second lossless integrator
Summary
The realization of a continuous-time filter utilizing the electronically adjustable active building block (ABB) has been mainly focused on the research topic due to its advantages, e.g., it gives better adjustment than varying the value of the passive device. It is a significant building block of analog signal processing, automatic control, and instrumentation systems, such as touch-tone telephone systems, three-way crossover networks, digital television (DTV), and phased locked loop circuits. An electronically and orthogonally controllable SITO VM multifunction biquadratic filtering circuit using LT1228 as an active building block is proposed in this paper. To affirm the circuit performance of the presented filter, the PSPICE simulation utilizing the LT1228 and theoretical results are described
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