New current-feedback operational amplifier-based bandpass shadow filter

2016 ◽  
Vol 54 (1) ◽  
pp. 95-101 ◽  
Author(s):  
Muhammad Taher Abuelma’atti ◽  
Naif Almutairi
Keyword(s):  
Operational Amplifier ◽  
Bandpass Filter ◽  
Center Frequency ◽  
Electronic Control ◽  
Current Feedback ◽  
Feedback Path ◽  
Electronic Tuning ◽  
Voltage Amplifier ◽  
Current Feedback Operational Amplifier ◽  
Electronically Tunable

This article presents a new topology for implementing an electronically tunable bandpass filter using the current-feedback operational amplifier. The electronic tuning of the center frequency of the proposed circuit is achieved using an externally connected voltage amplifier in the feedback path without disturbing the constituents of the filter itself, that is a shadow filter. The proposed circuit can be used for developing an undergraduate experiment which illustrates the operation of bandpass filter and the electronic control of its center frequency using the concept of shadow filter. Experimental results obtained using the AD844 current-feedback operational amplifier are included.

Design of the Voltage-Controlled Bandpass Filter Based on Current Feedback Op Amp

2014 ◽  
Vol 986-987 ◽  
pp. 1081-1085
Author(s):  
Sheng Qian Ma ◽  
Yan Ping Ji ◽  
Xing Ping Ran ◽  
Wei Zhao Zhang ◽  
Yang Yang
Keyword(s):  
Operational Amplifier ◽  
Input Voltage ◽  
Center Frequency ◽  
Band Pass Filter ◽  
Current Feedback ◽  
Loop Filter ◽  
Pass Filter ◽  
Voltage Signal ◽  
Band Pass ◽  
Current Feedback Operational Amplifier

This paper puts forward structure and realization method of the voltage-controlled band-pass filter based on the current feedback operational amplifier (CFA) which uses bi-quad loop filter circuit model to design the new filter circuit. Input voltage signal is input to voltage-controlled band-pass filter circuit composed by an analog multiplier AD835 and a current feedback operational amplifier AD8001 which are the core. Using the voltage signal to adjust the center frequency of the filter, the filter has wide frequency band and good high-frequency performance. This paper describes the design principles, infers the design formulas and designs the circuit of the voltage-controlled first-order and second-order band-pass filter.Through the simulation, the filter can realize the scope of the center frequency from 200KHz to 10MHz.

scholarly journals Low-Voltage CMOS Current Feedback Operational Amplifier and Its Application

ETRI Journal ◽  
2007 ◽  
Vol 29 (2) ◽  
pp. 212-218 ◽  
Author(s):  
Soliman A. Mahmoud ◽  
Ahmed H. Madian ◽  
Ahmed M. Soliman
Keyword(s):  
Operational Amplifier ◽  
Low Voltage ◽  
Current Feedback ◽  
Current Feedback Operational Amplifier

scholarly journals A memristor-based chaotic-masking for analog spread-spectrum communication

2019 ◽  
Vol 14 (2) ◽  
pp. 966
Author(s):  
Muhammad Taher Abuelma’atti ◽  
Abdullah Yousef Alnafisa
Keyword(s):  
Spread Spectrum ◽  
Operational Amplifier ◽  
Spread Spectrum Communication ◽  
Current Feedback ◽  
Square Wave ◽  
Chaos Generator ◽  
Current Feedback Operational Amplifier

<span>This paper presents a simple chaotic-masking system. The system uses a chaos generator built around a grounded memristor. The memristor is emulated using the current-feedback operational amplifier (CFOA). At the sending end the signal is masked by adding chaos. At the receiving end the signal is recovered by subtracting the chaos. The performance of proposed system is investigated using sinusoidal and square wave signals.</span>

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