Voltage-mode notch, lowpass and bandpass filterusingcurrent-feedback amplifiers

Chang, Chun-Ming; Hwang, Chyi; Tu, Steve Hung-Lung

doi:10.1049/el:19941416

Cited by 80 publications

(58 citation statements)

References 5 publications

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“…Only the circuits from [1], [6]-[9] realize fixedtopology single-input-multiple-output (SIMO)-type biquads with which this paper is concerned. A survey of the circuits from [1], [6]-[9] reveals that they suffer from one or more of the following drawbacks: (i) non-availability of infinite Z in (ii) non-availbility of tunability of all the parameters [6], [7], [9], and/or (iii) non-availability of all grounded/virtually grounded resistors [1] (three-CFOA-biquad therein), [6] and [9] and/or (iv) requirement of a relatively larger number (five to nine) of CFOAs [1] (five-CFOA-biquad therein), [8], [9].…”

Section: Introductionmentioning

confidence: 99%

CFOA-based state-variable biquad and its high-frequency compensation

Singh

Senani

2005

IEICE Electron. Express

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Abstract:A four-Current feedback operational amplifier (CFOA)-based state variable biquad is described which permits the accommodation of or compensation for the z-pin parasitic impedances of the CFOAsand offers a number of advantages over previously known CFOA-based biquad configurations. The workability of the circuit has been confirmed by SPICE simulation results based on commercially available AD844 type CFOAs.

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Section: Introductionmentioning

confidence: 99%

CFOA-based state-variable biquad and its high-frequency compensation

Singh

Senani

2005

IEICE Electron. Express

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“…As a result, a negative-type inverting second-generation current conveyor (ICCII-) has been proposed [1]. Quite a large number of studies have been devoted to the second-order voltage-mode analog filter realizations [2]- [5], [8]- [13]. The filters in [3], [5], [8], [10]- [13] can realize only one filter response at a time.…”

Section: Introductionmentioning

confidence: 99%

“…The filters in [3], [5], [8], [10]- [13] can realize only one filter response at a time. The filter in [2] can simultaneously realize lowpass and bandpass and notch responses, and the filters of [9] and [4] can simultaneously realize lowpass, bandpass, and highpass responses. However, none of these filters simultaneously realizes both positive and negative gain lowpass, bandpass, and highpass responses.…”

Section: Introductionmentioning

confidence: 99%

ICCII-Based Voltage-Mode Filter with Single Input and Six Outputs Employing Grounded Capacitors

Mınaeı

Yüce

Çiçekoğlu

2006

Circuits Syst Signal Process

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In this paper, a novel second-order voltage-mode filter with single input and six outputs employing inverting second-generation current conveyors (ICCIIs) is presented. This filter simultaneously realizes negative and positive gain lowpass, bandpass, and highpass filter responses, and does not require active and passive element matching. The new filter has low active and passive element sensitivities, and offers orthogonal control of the angular resonance frequency (ω o ) and quality factor (Q).

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“…In reality the perfection is not achievable. It can be improved when using an active notch filter which employs negative feedback around the operational amplifier [8].Twin-T notch filter with variable Q was designed to remove the 50Hz power line interference [9]. The higher the Q, the narrow the notch can be achieved and higher the level of attenuation needed to remove the unwanted signal.…”

Section: Notch Filtermentioning

confidence: 99%

Development of Electrocardiograph Monitoring System

Rosli

Omar

Hasan

et al. 2018

MATEC Web of Conferences

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Abstract. Electrocardiograph (ECG) monitoring system is one of the diagnostic tools which can help in reduce the risk of heart attack. A cardiologist may be able to determine heart condition from the ECG signal that recorded from subject. The purpose was to design an ECG monitoring system which consists of ECG circuit and digital signal processing system to deny the unwanted signal. In general, the ECG signal is nature weak and only around 1mV amplitude. Therefore filter and amplifier circuits were designed into 3 stages with a total gain of 1000 to bring the signal to around 1V. Circuit designed included of instrumentation amplifier, bandpass filter and notch filter. The frequency bandwidth of ECG is between 0.05Hz until 100Hz. Schematic circuit was tested by software simulation before proceeding to hardware implementation. Simulation analysis was done by using Software Proteus 8 Professional while the further signal processing was done in MATLAB software environment. A PQRST ECG waveform can be seen clearly after digital filtering stage in MATLAB environment. Digital signal processing in MATLAB software included of pre-filtering, Fast Fourier transform and peak detection. As conclusion, the time interval between peaks can be determined automatically which can provide useful information in clinical aspect.

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Voltage-mode notch, lowpass and bandpass filterusingcurrent-feedback amplifiers

Cited by 80 publications

References 5 publications

CFOA-based state-variable biquad and its high-frequency compensation

CFOA-based state-variable biquad and its high-frequency compensation

ICCII-Based Voltage-Mode Filter with Single Input and Six Outputs Employing Grounded Capacitors

Development of Electrocardiograph Monitoring System

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