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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Voltage-Mode Multifunction Biquad Filter and Its Application as Fully-Uncoupled Quadrature Oscillator Based on Current-Feedback Operational Amplifiers
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Voltage-Mode Multifunction Biquad Filter and Its Application as Fully-Uncoupled Quadrature Oscillator Based on Current-Feedback Operational Amplifiers

机译：基于电流反馈运算放大器的电压模式多功能等滤波器及其应用作为完全解耦正交振荡器

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摘要

This research introduces a new multifunction biquad filter based on voltage mode (VM) current-feedback operational amplifier (CFOA) and a fully uncoupled quadrature oscillator (QO) based on the proposed VM multifunction biquad filter. The proposed VM multifunction biquad filter has high impedance to the input voltage signal, and uses three CFOAs as active components, while using four resistors and two grounded capacitors as passive components. The VM CFOA-based multifunction biquad filter realizes band-reject, band-pass, and low-pass transfer functions at high-input impedance node simultaneously, which has the feature of easy cascading in VM operation without the need for additional voltage buffers. Additionally, the filter control factor parameter pole frequency (ωo) and quality factor (Q) of the proposed VM multifunction biquad filter can be independently set by varying different resistors. By slightly modifying the VM multifunction biquad filter topology, a VM fully-uncoupled QO is easily obtained. The difference from the previous VM CFOA-based multifunction biquad filter is that the proposed VM CFOA-based multifunction biquad filter can be independently controlled by the filter control factor parameters, ωo and Q. The proposed VM CFOA-based multifunction biquad filter can be transformed into a VM QO with fully-uncoupled adjustable of the oscillation condition and the oscillation frequency. The oscillation condition and the oscillation frequency can be fully-uncoupled and controlled by varying two sets of completely different resistors. The proposed VM fully-uncoupled QO solves the amplitude instability. The constant amplitude ratio of two quadrature sinusoidal waveforms can be realized when tuning FO. PSpice simulation and experimental results prove the performances of the proposed VM multifunction filter and VM fully-uncoupled QO. Simulation and experimental results confirm the theoretical analysis of the proposed circuits.
机译：本研究介绍了一种基于电压模式（VM）电流 - 反馈运算放大器（CFOA）的新型多功能等滤波器，以及基于所提出的VM多功能各等滤波器的完全解耦正交振荡器（Qo）。所提出的VM多功能双滤波器对输入电压信号具有高阻抗，并使用三个CFOAS作为有源组件，同时使用四个电阻和两个接地电容器作为无源元件。基于VM的基于VM的多功能各类电滤波器同时实现高输入阻抗节点的带拒表，带通和低通转移功能，其在VM操作中具有易于级联的特征，而无需额外的电压缓冲器。另外，通过改变不同的电阻，可以独立地设定所提出的VM多功能双滤波器的滤波器控制因子参数频率（ωo）和质量因子（Q）。通过略微修改VM多功能各种滤波器拓扑，可以轻松获得VM全耦合Qo。与以前的VM基于VM基于VM的多功能各种滤波器的差异是所提出的VM基于VM基础的多功能双滤波器可以由滤波器控制因子参数，ωo和Q独立控制。所提出的VM基于VM基于VM的多功能双滤波器可以转换进入VM QO，具有完全解耦的振荡条件和振荡频率。振荡条件和振荡频率可以通过改变两组完全不同的电阻来完全耦合并控制。所提出的VM完全解耦Qo解决了幅度不稳定性。在调谐FO时，可以实现两个正弦流波形的恒定幅度比。 PSPICE仿真和实验结果证明了所提出的VM多功能滤波器和VM完全解耦Qo的性能。仿真和实验结果证实了所提出的电路的理论分析。

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