基于OTRA的通用双二阶滤波器设计

提出了把通用双二阶滤波器视为负反馈放大器的观点,根据反馈电路的基本方程,利用3个MOS电阻、2个电容、2个运算跨阻放大器(OTRA)构成了通用双二阶滤波器,该滤波器不仅可从同一端口输出信号,从不同端口输入信号,而且可获得低通、高通、带通、带阻和全通输出.该电路结构简单,便于电控调谐.     

一系列新的基于电流模式的二阶滤波器

本文提出了一种新的基于电流模式的二阶滤波器综合电路，适当选择电路元件，可综合出一系列电流模式二阶低通、高通和带通滤波电路，对其中部分电路进行了理论设计和灵敏度分析，结果表明本文提出的电路灵敏度低、增益可独立调节。计算机仿真结果证实了理论分析的正确性。     

Nth order current mode universal filter using MOCCCIIs

This article presents a new current mode single-input-multiple-output nth order universal filter. The proposed circuit employs (n + 1) number multiple output second generation current conveyors and n number grounded capacitors only. Presented circuits can realize current mode low pass, high pass, band pass, notch and all pass responses simultaneously at different high output impedance terminals. The current mode filter circuit provides low input impedance by selecting the proper value of bias current and also has high output impedance, which is suitable for cascading. The circuit offers some important features such as resistor less realization, no passive component matching constraints, low sensitivity, electronic tunability and active-C realization. The functionality of the proposed filter circuit is tested with the PSPICE simulation, which is found to agree well with the proposed theory.     

一种基于MOCCII的n阶多功能滤波器

提出了一种由MOCCⅡ实现的单输入多输出n阶多功能滤波电路。该电路只需用n个MOCCⅡ、电容和电阻,适当选定输入输出端,可以实现n阶高通、低通、带通和带阻滤波功能。本文所提出的电路结构简单,所用的电容、电阻均接地,易于集成。PIPISE仿真结果进一步证明了理论分析的正确性。     

Performance analysis of a low power low noise tunable band pass filter for multiband RF front end

This paper presents a low power tunable active inductor and RF band pass filter suitable for multiband RF front end circuits. The active inductor circuit uses the PMOS cascode structure as the negative transconductor of a gyrator to reduce the noise voltage. Also, this structure provides possible negative resistance to reduce the inductor loss with wide inductive bandwidth and high resonance frequency. The RF band pass filter is realized using the proposed active inductor with suitable input and output buffer stages. The tuning of the center frequency for multiband operation is achieved through the controllable current source. The designed active inductor and RF band pass filter are simulated in 180 nm and 45 nm CMOS process using the Synopsys HSPICE simulation tool and their performances are compared. The parameters, such as resonance frequency, tuning capability, noise and power dissipation, are analyzed for these CMOS technologies and discussed. The design of a third order band pass filter using an active inductor is also presented.     

Electronically controlled high input and low output impedance voltage mode multifunction filter with grounded capacitors

In this study, a three-input single-output voltage-mode biquadratic filter employing voltage differencing differential input buffered amplifier (VD-DIBA) is presented. The proposed filter uses two VD-DIBAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The circuit provides five standard transfer functions, namely, low pass, high pass, band pass, notch and all pass filters with electronic control of quality factor and pole frequency. Each transfer function can be selected by suitably selecting input signals via digital method. The filter does not require inverting of the input voltage signal. Moreover, the circuit possesses high input and low output impedances and thus it enables simple voltage-mode cascading. The PSPICE simulation and also experimental results are included, verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation.     

Current mode high-frequency KHN filter employing differential class AB log domain integrator

In this study, a current mode log domain differential Class AB biquad filter based on Kerwin–Huelsman–Newcomb (KHN) structure has been synthesized by using the state-space method and by adopting translinear circuits. The proposed circuit can produce second-order low pass, band pass, high pass, all pass, and notch filter characteristics. The circuit is synthesized for high-frequency applications, i.e. around 100 MHz. The natural frequency and Q quality factor of the filter can be tuned electronically by varying the currents of current sources. Moreover, by varying currents of selected current sources, one can change the characteristics of the notch filter to generate general, low pass, and high pass notch filters. The designed circuit is simulated in both time domain and frequency domain in PSpice by using both idealized and NE 600 series type real transistors that are suitable for high-frequency operations. The frequency as well as time domain responses are found to be as expected. In addition to these simulations, THD and noise analysis are carried out. The details of obtained results are given.     

一种基于CMOS CCDVCC Ⅱ的可编程多功能滤波器及可编程测量放大器

介绍了一种新型的电调谐差分电压输入第二代电流传输器.并且用其构成一种电压模式多功能滤波器,可以获得:低通、高通、带通、带阻、全通传输函数.且这种滤波器可以通过调节电流传输器偏置电流独立改变传输函数的品质因素和固有频率.这种多功能滤波器仅仅使用两个CCDVCCⅡ、一个电阻和两个电容构成,且不需要任何元件匹配.而且,可以利...     

一种新型的有源R滤波器

本文所介绍的滤波器电路的特性参数往往仅与电阻比值有关，从而极有地集成，精度高、性能稳定。     

Third-order voltage-mode active-C band pass filter

In this research article, a new third-order voltage-mode active-C asymmetrical band pass filter is proposed. It uses three numbers of current-controlled current conveyors and three numbers of equal-valued capacitors. The topology has the following important features: uses only three active elements, uses three capacitors, uses all grounded capacitors and no resistor is suitable for integrated circuit design, there is no matching constraint, high input impedance, low output impedance, central frequency can easily be electronically controlled by bias current, and frequency response is asymmetrical in nature. The application of the proposed topology in the realisation of a voltage-mode sixth-order symmetrical band pass filter has been demonstrated. The workability of the proposed topology and sixth-order filter has been confirmed by simulation results using 0.35-µm Austria Micro Systems complementary metal oxide semiconductor technology.     

基于半模基片集成波导的新型带通滤波器研究

在半模基片集成波导上嵌入互补开环谐振器结构,设计了一种结构紧凑的新型带通滤波器.该结构允许低于截止频率以下传输正向波,利用具有高通特性的半模基片集成波导和互补开环谐振器组成具有带通特性的滤波器,通过改变互补开环谐振器结构参数,非常容易调节带通滤波器通带频率,利用该特性可以更容易实现任意通带微波滤波器.该滤波器具有体积小巧、损耗低、易制作、方便与其他电路集成等优势.     

一种基于OTA和MOCCII实现的n阶多功能滤波器

提出了一种基于运算跨导放大器和第二代电流传输器结合的电流模式多功能滤波器方法。该方法是将高阶通用电流模式滤波器的传递函数分解为n个无损积分器级联的形式,适当选定输入电流信号可同时实现低通、高通、带通、带阻等滤波功能,而电路内部结构及器件数目无需改变。与同类电路相比,其设计简便、结构简单、无源元件全部接地,且易于集成。同时文中还给出了滤波器的设计实例,Pspice仿真结果与理论分析相吻合,也验证了该方法的可行性。该滤波器可用于通信、电子测量与仪器仪表的信号处理中。     

一种超宽阻带微带低通滤波器的设计

基于传统阶跃阻抗滤波器,提出了一种易于实现的超宽阻带微带低通滤波器改进设计方案。低阻抗线部分采用扇形微带结构,在同等阶数下,该结构的滤波器与传统阶跃阻抗滤波器相比,具有更紧凑的电路结构以及更好的阻带特性。在滤波器末端并联开路短截线,使得阻带增加额外传输陷波点来抑制寄生通带。利用ADS和HFSS仿真软件对滤波器结构进行优化设计,并进行了实物的加工和测试。实测结果表明,通带3 dB 截止频率为2 GHz,通带内0-1.8 GHz 回波损耗大于20 dB,3-20 GHz 频率范围内的阻带抑制能达到25 dB 以上。     

Fault Detection of Analog Circuits Using Network Parameters

A new method to detect component faults in analog circuits is proposed in this paper. Network parameters like driving point impedance, transfer impedance, voltage gain and current gain are used to detect component faults in analog circuits as these network parameters are sensitive to the components of the circuit. Using montecarlo simulation each component of the circuit is varied within its tolerance limit and the minimum and the maximum values of each network parameter are found for fault free circuit. At the time of testing, the network parameters are found for the injected fault and if any one or more network parameters is exceeding its predetermined bound limits then the circuit is confirmed faulty. The proposed method is validated through second order Sallenkey band pass filter and fourth order Chebyshev low pass filter circuits. Numerical results are presented to clarify the proposed method and prove its efficiency.     

New lossy/loss-less synthetic floating inductance configuration realized with only two CFOAs

A new CFOA-based lossy/loss-less floating inductance circuit is introduced which, in contrast to previously known configuration requiring three to four CFOAs, employs only two CFOAs along with only five passive components. The workability of the new FI circuit has been demonstrated by using it to design a second order notch filter and a fourth order Butterworth low pass filter by realizing the circuit using commercially available AD844-type CFOAs.     

一种新颖的蝴蝶结形缺陷接地结构微带线

提出一种新颖的蝴蝶结形缺陷接地结构(DGS)微带线,分析了该微带线的带阻特性和慢波特性,同时考虑微带线损耗,建立了该微带线的等效电路模型及其参数提取,并分析了蝴蝶结形DGS结构变化对阻带特性的影响,最后将该DGS结构应用于紧凑结构低通滤波器的设计,模拟结果与实验结果吻合较好,验证了所提结构的可靠性。     

窄带LC带通滤波器的设计与实现

为适应现代舰载电子战设备对低频滤波器的严格要求,通过对传统带通滤波器的结构进行适当的网络变换,得到了一种可靠的电路结构。该结构将原有集总参数带通网络的电路元件参数值转化成常见量值,同时最大程度地吸收了集总元件的寄生参数,使滤波器的性能更加稳定。测试结果表明：采用该结构的滤波器具有很窄的带宽、较高的阻带抑制度以及优良的电...     

A design of the novel coupled-line bandpass filter using defectedground structure with wide stopband performance

In this paper, a novel three-pole coupled-line bandpass filter with a microstrip configuration is presented. Presented bandpass filters use defected ground structure (DGS) sections to simultaneously realize a resonator and an inverter. The proposed coupled-line bandpass filter provides compact size with low insertion-loss characteristic. Furthermore, a DGS shape for a microstrip line is newly proposed. The proposed DGS unit structure has a resonance characteristic in some frequency band. The proposed coupled-line filter can provide attenuation poles for wide stopband characteristic due to resonance characteristic of DGS. The equivalent circuit for the proposed DGS unit section is described. The equivalent-circuit parameters for DGS are extracted by using a three-dimensional finite-element-method calculation and simple circuit analysis method. A design method for the proposed coupled-line filter is derived based on coupled-line filter theory and the equivalent circuit of the DGS. The experimental results show excellent agreements with theoretical simulation results     

基于接地开口环的超宽阻带带通滤波器设计

在通带附近引入传输零点可以得到具有良好带外抑制特性的带通滤波器。提出了一种新型的接地开口谐振单元并提取了该单元结构的等效电路模型。通过与电磁仿真结果对比,证明了对单元结构分析的准确性与提取等效电路模型的有效性。结果表明,该谐振单元在高频段引入了一个传输零点。同时,在基本不影响通带中心频率的前提下,可以通过改变部分结构参数来调整该传输零点的位置进行灵活设计。最后,利用3个单元结构的级联设计具有良好通带特性及带外抑制特性的带通滤波器。对滤波器进行了仿真、加工及测试,测试结果与仿真结果有良好的一致性。     

Compact low voltage high-Q CMOS active inductor suitable for RF applications

A compact active inductor circuit is proposed. The circuit is based on the gyrator-C approach with both transconductance stages realized by MOS transistors in common-source configuration. The circuit has minimal number of transistors, is suitable for low voltage operation, offers a wide inductive band, high quality factor and low power dissipation. Simulation results are provided for a 0.13 μm CMOS process with 1.2 V supply voltage.