Electronically controllable first-order multifuntion filter with using single active building block

Chinpark, Kobkiat; Jaikla, Winai; Siripongdee, Surapong; Suwanjan, Peerawut

doi:10.1109/iccre.2018.8376462

Cited by 12 publications

(19 citation statements)

References 22 publications

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“…From Table 1, the following may be noted: The circuits of previous works 2,29–43 use more than one ABB, two ABBs 2,29–42 and three ABBs, 43 and, hence, do not belong to the class of single‐ABB‐based first‐order UAFs to which the circuits proposed in this article belong to. The single‐ABB‐based earlier works 3,10,12–14 use only a single ABB but realize a UAF only in CM, whereas other studies, 16–27 too, use only one ABB but realize an UAF only in VM. On the other hand, the single ABB configuration of Chaturvedi and Kumar 11 is in CM/TAM mode, whereas single ABB configuration of Maheshwari et al 15 and Singh et al 24 are in VM/TAM mode. None of the building blocks employed in previous works 3–24,26,27 are yet available as off‐the‐shelf ICs. The circuits of previous studies 5,14,20–22,24–27 do not employ a grounded capacitor. The UAFs in previous works, 5,16–19,21,23–25,27 do not have the appropriate Z in or Z out to enable cascadability. The only other earlier work which is based upon the use of a commercially available IC (namely, the LT1228 comprising an OTA followed by a CFOA) also realizes only VM UAF and does not employ a grounded capacitor. …”

Section: Introductionmentioning

confidence: 95%

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CFOA‐based simple mixed‐mode first‐order universal filter configurations

Bhaskar

Raj

Senani

et al. 2022

Circuit Theory & Apps

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This brief communication presents two current feedback op-amp (CFOA)based simple first-order mixed-mode universal filter topologies-one of them providing first-order low-pass (LP), high pass (HP), and all pass (AP)-all the three filters in voltage-mode (VM)/trans-admittance-mode (TAM) while the other one realizing the quoted three functions in current-mode (CM)/transimpedance-mode (TIM). Except the all pass filter realization from the first configuration which needs a second CFOA also as gain-of-two amplifier, in all the remaining cases of both the configurations, only a single CFOA is needed. The other notable features of the circuits are employment of only three resistors and a grounded capacitor (as preferred for IC implementation) and the availability of independent tunability of the gain (H 0 ) and cut-off frequency/pole frequency (ω 0 ) of all the three filters, in both the cases. In spite of not offering ideally infinite input impedance in VM/TAM mode and ideally zero input impedance in CM/TIM mode, the circuits still possess easy cascadability due to providing a voltage output from a low-output impedance terminal W while the current output from the high output impedance terminal Z. Non-ideal and sensitivity analyses have also been carried out. The workability of the proposed circuits has been demonstrated through PSPICE simulations and experimental results using the commercially available AD844-type IC CFOA.

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Section: Introductionmentioning

confidence: 95%

“…A brief overview of earlier published first‐order UAFs is now in order. However, in order to keep the overview of the earlier works 2–43 as brief as possible, we have compiled the relevant data in tabular form as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

CFOA‐based simple mixed‐mode first‐order universal filter configurations

Bhaskar

Raj

Senani

et al. 2022

Circuit Theory & Apps

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“…Transresistance-mode (RM) and transconductance-mode (TM) universal first order filters are reported in [22,28,31] (Figure 2), respectively. The universal first-order filters in voltage-mode (VM) configuration are proposed in [23,25,27,32,33,38,40,[42][43][44]. The comparison between the proposed first-order universal filter and the previous ones presented in is summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the proposed universal first-order filters are emphasized for the on-chip realization of both CMOS [21][22][23][24][25][26][27][28][29][30][31][32][34][35][36]40,41,45] or BJT [33,37,39] technology. As stated above, the implementation of an on-chip circuit is quite costly.…”

mentioning

confidence: 99%

“…Most of the universal first-order filters shown in Table 1 can provide three responses: low-pass, high-pass, and all-pass functions (except in [22], which gives only two filtering responses). However, the lagging and leading phase responses of the all-pass filters in [21][22][23][24][25][26][27][28][29][30][31]33,36,38,[40][41][42][43] are not given in the same circuit structure.…”

mentioning

confidence: 99%

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Single Commercially Available IC-Based Electronically Controllable Voltage-Mode First-Order Multifunction Filter with Complete Standard Functions and Low Output Impedance

Jaikla

Buakhong

Siripongdee

et al. 2021

Sensors

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This paper presents the design of a voltage-mode three-input single-output multifunction first-order filter employing commercially available LT1228 IC for easy verification of the proposed circuit by laboratory measurements. The proposed filter is very simple, consisting of a single LT1228 as an active device with two resistors and one capacitor. The output voltage node is low impedance, resulting in an easy cascade-ability with other voltage-mode configurations. The proposed filter provides four filter responses: low-pass filter (LP), high-pass filter (HP), inverting all-pass filter (AP−), and non-inverting all-pass filter (AP+) in the same circuit configuration. The selection of output filter responses can be conducted without additional inverting or double gains, which is easy to be controlled by the digital method. The control of pole frequency and phase response can be conducted electronically through the bias current (IB). The matching condition during tuning the phase response with constant voltage gain is not required. Moreover, the pass-band voltage gain of the LP and HP functions can be controlled by adjusting the value of resistors without affecting the pole frequency and phase response. Additionally, the phase responses of the AP filters can be selected as both lagging or leading phase responses. The parasitic effects on the filtering performances were also analyzed and studied. The performances of the proposed filter were simulated and experimented with a ±5 V voltage supply. For the AP+ experimental result, the leading phase response for 1 kHz to 1 MHz frequency changed from 180 to 0 degrees. For the AP− experimental result, the lagging phase response for 1 kHz to 1 MHz frequency changed from 0 to −180 degrees. The design of the quadrature oscillator based on the proposed first-order filter is also included as an application example.

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First‐order universal shadow filter designs with scaled time constants

Nako,

Psychalinos,

Minaei

2024

Circuit Theory & Apps

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First‐order generalized filter designs which simultaneously offer implementation of the low‐pass, high‐pass, and all‐pass filters basic functions with scaling of the associated time constant are presented in this work. These have been achieved thanks to the employment of the shadow filtering technique, which enables the utilization of a “hidden filter” for performing scaling of the time constant. The resulting filters offer also a high‐impedance input, and as the outputs are also taken from low‐impedance nodes, there is not any imposed restriction concerning their cascadability. The provided simulation and experimental results confirm the validity of the proposed concept.

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Electronically controllable first-order multifuntion filter with using single active building block

Cited by 12 publications

References 22 publications

CFOA‐based simple mixed‐mode first‐order universal filter configurations

CFOA‐based simple mixed‐mode first‐order universal filter configurations

Single Commercially Available IC-Based Electronically Controllable Voltage-Mode First-Order Multifunction Filter with Complete Standard Functions and Low Output Impedance

First‐order universal shadow filter designs with scaled time constants

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