共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
本文提出一种分析具有非理想运放的SC滤波器的方法.通过对二阶带通滤波器的计算说明了运放增益带宽乘积GB对滤波器性能的影响,证明了本方法的可行性和正确性. 相似文献
5.
6.
7.
8.
9.
10.
11.
Bilgin Metin Erkan Yuce Oguzhan Cicekoglu 《Electrical Engineering (Archiv fur Elektrotechnik)》2007,89(7):563-567
In this paper, a new voltage mode universal filter topology is presented. The proposed topology can provide three circuits
with all-pass, notch, band-pass, low-pass and high-pass filtering functions employing minimum number of active and passive
components, namely a single first generation current conveyor, two resistors and two capacitors. Furthermore, these circuits
obtained from general topology have dual outputs that can be used simultaneously. Sensitivities of the pole frequency and
quality factor of the filter to the passive components can be made lower than unity in magnitude. Finally, natural frequencies
of the presented circuits are independent from non-ideal voltage gain of the active element. Simulations are performed to
verify the theoretical results. 相似文献
12.
Shuenn‐Yuh Lee Ming‐Chun Liang Tsung‐Heng Tsai Wei‐Chun Kao 《International Journal of Circuit Theory and Applications》2013,41(11):1188-1202
This paper presents an ultra‐low‐power fourth‐order bandpass operational transconductance amplifier‐C (OTA‐C) filter for an implantable cardiac microstimulator used to detect the R‐wave of intracardiac electrograms. The OTA‐C filter fabricated by TSMC 0.35‐µm complementary metal–oxide–semiconductor (CMOS) technology is operated in the subthreshold region to save power under a supply voltage of 1 V. The current cancellation technique is adopted to reduce the transconductance of the amplifier. Through this, the low‐frequency OTA‐C filter can be realized by ultra‐low transconductance with on‐chip capacitors. Direct comparison to conventional RLC ladders replaced by OTA‐C circuits shows that the method of reducing the number of OTAs further diminishes power consumption. Design issues, including ultra‐low transconductance, linearity, and noise, are also discussed. Measurement results show that the low‐voltage, low‐power filter has a bandwidth between 10 and 50 Hz, third inter‐modulation distortion of ?40 dB, dynamic range of 43 dB, and power consumption of only 12 nW. The real electrocardiography signal is fed into the bandpass filter to verify the function of signal processing with the distribution of the R‐wave. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
13.
Chun‐Ming Chang M. N. S. Swamy 《International Journal of Circuit Theory and Applications》2012,40(5):421-454
Complementary single‐ended‐input operational transconductance amplifier (OTA)‐based filter structures are introduced in this paper. Through two analytical synthesis methods and two transformations, one of which is to convert a differential‐input OTA to two complementary single‐ended‐input OTAs, and the other to convert a single‐ended‐input OTA and grounded capacitor‐based one to a fully differential OTA‐based one, four distinct kinds of voltage‐mode nth‐order OTA‐C universal filter structures are proposed. TSMC H‐Spice simulations with 0.35µm process validate that the new complementary single‐ended‐input OTA‐based one holds the superiority in output precision, dynamic and linear ranges than other kinds of filter structures. Moreover, the new voltage‐mode band‐pass, band‐reject and all‐pass (except the fully differential one) biquad structures, all enjoy very low sensitivities. Both direct sixth‐order universal filter structures and their equivalent three biquad stage ones are also simulated and validated that the former is not absolutely larger in sensitivity than the latter. Finally, a very sharp increment of the transconductance of an OTA is discovered as the operating frequency is very high and leads to a modified frequency‐dependent transconductance. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
14.
Shibendu Mahata Rajib Kar Durbadal Mandal 《International Journal of Circuit Theory and Applications》2020,48(9):1554-1560
In this letter, the optimal rational approximation of fractional-order bandpass Butterworth filter (FOBBF) is presented. The transfer function of the FOBBF is decomposed into a multiplication of first-order and second-order terms. As a result, the design stability conditions can be easily satisfied using only the variable boundary constraints. The proposed technique generalizes the symmetric fractional-order roll-off characteristic as only a special case of the asymmetric one. Several examples are presented to validate the modeling efficacy. 相似文献
15.
基于传统的梳妆线谐振式滤波器设计原理及微带线定向耦合器理论,提出了一种新型的吸收式带通滤波器,其特点是滤波器的电压驻波比不仅在通带内很好,通带外很大频率范围内驻波也小于3.5,这也是该滤波器与常用的反射式滤波器的区别。首先,该滤波器采用微带线结构实现,与传统LC结构滤波器相比,可应用于更高的频段;其次,该滤波器具有较宽的带宽;再者,该滤波器设计灵活简单、成本低、易于集成。通过MWO软件仿真优化,实现了通带中心频率为3500MHz、3d B带宽为479MHz、通带内插入损耗小于3d B、通带内电压驻波比小于2、带外驻波比在很大频率范围内小于3.5的新型微带吸收式带通滤波器的设计。 相似文献
16.
17.
应用MAX264设计程控滤波器 总被引:1,自引:0,他引:1
本设计应用集成芯片MAX264设计一个程控滤波器。该滤波器主要由3个模块组成:前置放大、滤波电路、单片机显示与控制电路等。前置放大采用集成运放AD620构成;滤波器采用MAX264。然后利用单片机对MAX264编程,实现低通、高通及椭圆滤波器。通过测试达到了以下要求:输入正弦电压振幅为10mV时,总增益为40dB,通频带为100Hz~40kHz,;低通和高通滤波器,其-3dB截止频率fc在1~20kHz范围内可调,频率步进为1kHz,低通在2fc处总电压增益不大于30dB;高通在0.5fc处总电压增益不大于30dB;四阶椭圆型低通滤波器,带内起伏≤1dB,-3dB通带为50kHz,-3dB通带误差不大于5%。 相似文献
18.
一种新型可调谐微带带通滤波器的设计 总被引:10,自引:3,他引:7
利用微带线的原理和电压调谐变容二极管的特性,结合对射频捷变信号源中常用的上变频系统的研究,设计出一种中心频率可调谐、相对带宽可调谐、可进行精度校准的微带带通滤波器。该滤波器针对射频输出中包含的多种杂散分量的特征,应用单级滤波网络或谐振网络进行专门抑制再级联,具有原理简单、结构灵活、易于扩展、调谐速度快、工作频带宽、尺寸小、成本较低等优点。实际测试结果与利用Serenade8.7软件仿真结果基本一致,性能指标能够达到设计要求。 相似文献
19.
Shibendu Mahata Rajib Kar Durbadal Mandal 《International Journal of Circuit Theory and Applications》2021,49(1):213-220
This letter presents the design of digital fractional‐order Butterworth filter (DFOBF) of order (n+α) , where n is an integer, and α ∈ (0,1) , from the perspective of optimal realization. The magnitude–frequency characteristic of the DFOBF is optimally modeled using the computationally efficient lattice wave digital filters (LWDFs). Design examples for the third‐ and fifth‐order LWDF‐DFOBFs with various values of n, α, and cut‐off frequencies are presented. 相似文献