Low-output-impedance electronically adjustable universal filter using voltage differencing buffered amplifiers

Pimpol, Jirapun; Roongmuanpha, Natchanai; Tangsrirat, Worapong

doi:10.1145/3323716.3323738

Cited by 4 publications

(13 citation statements)

References 2 publications

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“…ABBs have been published in the open technical literature [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22]. VM multifunction biquadratic filters composed of various highperformance ABBs, such as voltage differencing buffered amplifier (VDBA) [23], [24], [25], [26], current feedback amplifier (CFA) [27], [28], [29], [30], [31], [32], differential difference transconductance amplifier (DDTA) [33], voltage differencing differential difference amplifier (VDDDA) [34], voltage differencing differential input buffered amplifier (VD-DIBA) [35], [36], operational transconductance amplifier (OTA) [37], [38], [39], and LT1228 [40], [41], [42], [43], [44], can be found in the open literature and play an important role in various electronic systems. Biquadratic filters generally implement LP, BP, HP, RN and all-pass (AP) filtering ...…”

Section: Introductionmentioning

confidence: 99%

“…The focus of this study is the simultaneous implementation of LP, BP, HP and LPN/RN filters from the same configuration, providing independent control of their filter gains. Reviewing the technical literature published in [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], and [43], these circuits suffer from one or more of the following drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…1) Lack of high input impedance for the cascaded input voltage signals [42]. 2) Lack of three low output impedances for the cascaded output voltage signals [20], [23], [24], [25], [26], [35], [36], [37], [38], [39], [40], [41], [42]. 3) No orthogonal and electronic tunability of the ω o and Q [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [35], [36], [41].…”

Section: Introductionmentioning

confidence: 99%

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Two New and Improved Electronically Adjustable Voltage-Mode Multifunction Biquadratic Filters With Independent Control of Band-Pass, High-Pass, and Low-Pass/Regular Notch Filter Gains

et al. 2023

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In this study, two new and improved electronically adjustable voltage-mode (VM) biquadratic filters using three off-the-shelf LT1228 integrated circuits (ICs), two grounded capacitors (GCs), and six resistors are proposed for independent control of the band-pass (BP), high-pass (HP), and low-pass/regular notch (LPN/RN) filter gains. Each proposed electronically adjustable VM multifunction biquadratic filter has one input and six output voltages, enabling simultaneous realization of one low-pass (LP), two BP, two HP, and one LPN/RN filtering responses from the same configuration. Each filter parameter, namely the pole angular frequency (ω o ) and quality factor (Q), can be electronically controlled and orthogonally adjusted by the corresponding LT1228 bias current I B . In special cases, the parameters of ω o and Q can be electronically controlled and independently adjusted. Each electronically adjustable VM multifunction biquadratic filter has one high input impedance and three low output impedances for independent control of BP, HP, and LPN/RN filter gains. Due to its one high input impedance and three low output impedances, each proposed filter is suitable for cascaded VM circuits without external voltage buffers. Pspice simulations are used to verify the theoretical structure analysis of each proposed LT1228-based electronically adjustable VM multifunction biquadratic filter. Furthermore, experimental tests are performed using three off-theshelf LT1228 ICs, and several passive components to verify and evaluate the performance of each proposed LT1228-based biquadratic filter.INDEX TERMS LT1228, analog circuit design, integrated circuits, voltage-mode, filters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two New and Improved Electronically Adjustable Voltage-Mode Multifunction Biquadratic Filters With Independent Control of Band-Pass, High-Pass, and Low-Pass/Regular Notch Filter Gains

et al. 2023

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“…Reported VDBA-based universal biquadratic filters have three major limitations that severely curtail their application spectrum, which are: (a) non-availability of all five filter responses, (b) the employment of floating passive components, and (c) passive component matching constraints. It can be inferred from the comparative study that out of the 30 designs available in the literature; only 15 can provide all five filter responses in either VM and CM mode [23,26,[34][35][36]39,[41][42][43][44][45][46][47][48][49]52]. Most importantly, none of the VDU-based filter structures can operate in mixed-mode configuration.…”

Section: Introductionmentioning

confidence: 99%

Voltage Differencing Buffered Amplifier-Based Novel Truly Mixed-Mode Biquadratic Universal Filter with Versatile Input/Output Features

et al. 2022

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In this paper, a first-of-a-kind mixed-mode universal filter employing three VDBAs and three passive components, is proposed. The filter operates in all four modes and provides all five filter responses, namely voltage-mode (VM), current-mode (CM), trans-impedance-mode (TIM), or trans-admittance-mode (TAM). Additionally, the same filter topology can also work as a CM single-input-multi-output (SIMO) filter. A state-of-the-art comparison of various ‘voltage differencing’ variants of the voltage differencing buffered amplifier (VDBA)-based SIMO/MISO (single-input-multi-output/multi-input-single-output)-type biquad filters further highlight the significance of the presented research. In the proposed no passive component matching is required for generating the filter responses. The filter circuit also provides inbuilt tunability of the quality factor independent of the pole frequency. The non-ideal frequency dependent gain and component sensitivity analyses of the filter were also performed. The Silterra Malaysia 0.18μm process design kit (PDK) is employed to design and validated the proposed VDBA-based filter using the Cadence design software. The simulation results closely follow the theoretical predictions. To further verify the practical feasibility of the proposed filter, an experimental evaluation is also completed. The VDBA-based filter is implemented using off-the-shelf operational transconductance amplifiers Intersil CA3080, Texas Instruments LF356 op-amp, and Analog Devices AD844s. The filter is designed for a characteristic frequency of 100 kHz. The time and frequency domain measurement results indicate the proper functioning of the filter.

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“…Nowadays, the realization of an active analog filter using versatile active building blocks has been focused by many researchers due to many advantage features, such as simple circuitry, high linearity, and wide dynamic range. In the literature, many modern active electronic elements have been utilized in analog active filter design, such as current conveyor (CC) [1][2][3][4][5][6][7], differential difference current conveyor (DDCC) [8][9][10][11][12], differential voltage current conveyor (DVCC) [13][14][15][16], fully differential second-generation current conveyor (FDCCII) [17], current differencing buffered amplifier (CDBA) [18][19][20], current feedback operational amplifier (CFOA) [21][22][23][24][25][26][27], current follower transconductance amplifier (CFTA) [28][29], operational transconductance amplifier (OTA) [30][31][32][33][34], voltage differencing buffered amplifier (VDBA) [35][36], voltage differencing inverting buffered amplifier (VDIBA) [37], fully balanced voltage differencing buffered amplifier (FB-VDBA) [38], voltage differencing transconductance amplifier (VDTA) [39][40][41], and voltage diffe...…”

Section: Introductionmentioning

confidence: 99%

Electronically Tunable Triple-Input Single-Output Voltage-Mode Biquadratic Filter Implemented with Single Integrated Circuit Package

Roongmuanpha¹,

Suesut²,

Tangsrirat³

2021

Adv. sci. technol. eng. syst. j.

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This article proposes a compact and simple design of electronically adjustable voltage-mode biquadratic filter using fundamental active cell implemented on a single integrated circuit (IC) package as LT1228. The proposed circuit having triple inputs and single output (TISO) employs namely one resistor and two capacitors as the passive components. All the five possible biquadratic filtering responses, namely low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP), are realized by the appropriate selection of the relevant input signals. The pole angular frequency and the quality factor of the proposed TISO filter are electronically tunable through the bias current of the IC chip LT1228. Nonideal effects and sensitivity performance are carried out. The theoretical results are satisfactorily validated by both PSPICE simulation results and experimental measurements using commercially available LT1228.

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Low-output-impedance electronically adjustable universal filter using voltage differencing buffered amplifiers

Cited by 4 publications

References 2 publications

Two New and Improved Electronically Adjustable Voltage-Mode Multifunction Biquadratic Filters With Independent Control of Band-Pass, High-Pass, and Low-Pass/Regular Notch Filter Gains

Two New and Improved Electronically Adjustable Voltage-Mode Multifunction Biquadratic Filters With Independent Control of Band-Pass, High-Pass, and Low-Pass/Regular Notch Filter Gains

Voltage Differencing Buffered Amplifier-Based Novel Truly Mixed-Mode Biquadratic Universal Filter with Versatile Input/Output Features

Electronically Tunable Triple-Input Single-Output Voltage-Mode Biquadratic Filter Implemented with Single Integrated Circuit Package

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