Abstract
This paper proposes a high-input impedance voltage-mode (VM) multifunction biquad filter which employs three current-feedback amplifiers (CFAs), three resistors, and two grounded capacitors. The proposed VM multifunction biquad filter has single-input and triple-output and can realize non-inverting low-pass (NLP), inverting band-pass (IBP), and non-inverting band-stop (NBS) voltage responses at the same time without increasing component selection. The proposed VM multifunction biquad filter enjoys the orthogonal tunability of angular frequency and quality factor and also provides the advantage of using only two grounded capacitors, high-input impedance and low active/passive sensitivity. The performance of the proposed VM multifunction biquad filter is verified through its hardware implementation and OrCAD PSpice simulation based on AD844-type CFAs. The circuit analysis, sensitivity analysis, and NLP, IBP, and NBS voltage responses are also shown in this paper. The paper presents a method to effectively reduce the active and passive components, maintain good circuit performance, and reduce circuit costs.
Highlights
Due to the flexibility and versatility of high-input impedance single-input and tripleoutput voltage mode (VM) multifunction biquad filters in practical applications, people are increasingly interested in their design
Port Tz has high‐output impedance an ωo and Q of the filter cancurrent be obtained by the equations: the output (ITz) sinks thefollowing negative‐port input current (I−)
The 1-dB compression (P1dB) point is a key metric to determine the linear region of the circuit’s operation. This point represents that the input power reduces 1 dB gain from the normal linear gain specification
Summary
Due to the flexibility and versatility of high-input impedance single-input and tripleoutput voltage mode (VM) multifunction biquad filters in practical applications, people are increasingly interested in their design. The circuit in [19] described a biquad for realizing VM NLP, non-inverting band-pass (NBP), and non-inverting high-pass (NHP) voltage responses simultaneously; but it uses four CFAs, two capacitors, and six resistors. A high-input impedance two-input triple-output VM multifunction biquad filter has been proposed in [23], which can simultaneously realize NLP, NBP, and NBS voltage responses at high-input impedance terminal, and the circuit parameters of ωo and Q offer orthogonal controllability. The proposed circuit employs three CFAs, two grounded capacitors, and three resistors with high-input impedance It can simultaneously realize NLP, IBP, and NBS responses at high-input impedance terminal and still enjoys the orthogonal controllability of ωo and Q.
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