Three new CFOA-based SIMO-type universal active filter configurations with unrivalled features

Bhaskar, D. R.; Raj, Ajishek; Senani, Raj

doi:10.1016/j.aeue.2022.154285

Cited by 12 publications

(31 citation statements)

References 47 publications

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“…The universal filters are the systems that can realize several filtering functions into the same topology such as low-pass (LP), high-pass (HP), band-pass (BP), band-stop (BS), and all-pass (AP) filters, usually with second-order transfer functions [ 1 , 2 , 3 , 4 , 5 ]. These second-order filters can be applied for three-way high-fidelity loud-speakers, phase-locked loops, and high-order filters [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

Kumngern

Khateb

Kulej

2023

Sensors

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This paper presents new voltage-mode shadow filters employing a low-power multiple-input differential difference transconductance amplifier (MI-DDTA). This device provides multiple-input voltage-mode arithmetic operation capability, electronic tuning ability, high-input and low-output impedances. Therefore, the proposed shadow filters offer circuit simplicity, minimum number of active and passive elements, electronic control of the natural frequency and the quality factor, and high-input and low-output impedances. The proposed MI-DDTA can work with supply voltage of ±0.5 V and consumes 9.94 μW of power. The MI-DDTA and shadow filters have been designed and simulated with the SPICE program using 0.18 μm CMOS process parameters to validate the functionality and workability of the new circuits.

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Section: Introductionmentioning

confidence: 99%

Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

Kumngern

Khateb

Kulej

2023

Sensors

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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%

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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“…The technique of [ 23 , 24 ] is implemented with three commercially available AD844 ICs, but neither the pole angular frequency (ω o ) nor the quality factor (Q) can be electronically adjusted. In [ 25 ], four CFA active components, seven/eight passive components, and one/two switches (SWs) are used in each VM second-order filter circuit design. Each circuit in [ 25 ] is implemented using four commercially available AD844 ICs, allowing four different filter responses simultaneously, but the parameters ω o and Q of each circuit still cannot be electronically adjusted.…”

Section: Introductionmentioning

confidence: 99%

“…In [ 25 ], four CFA active components, seven/eight passive components, and one/two switches (SWs) are used in each VM second-order filter circuit design. Each circuit in [ 25 ] is implemented using four commercially available AD844 ICs, allowing four different filter responses simultaneously, but the parameters ω o and Q of each circuit still cannot be electronically adjusted. In [ 26 , 27 ], three voltage differencing differential difference amplifier (VDDDA) active components and three passive components are used in the VM second-order filter circuit design.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Input Impedance Electronically Tunable Voltage-Mode Second-Order Low-Pass, Band-Pass, and High-Pass Filters Based on LT1228 Integrated Circuits

Chen¹,

Chen²,

Chang³

2022

Sensors

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This paper introduces two new high-input impedance electronically tunable voltage-mode (VM) multifunction second-order architectures with band-pass (BP), low-pass (LP), and high-pass (HP) filters. Both proposed architectures have one input and five outputs, implemented employing three commercial LT1228 integrated circuits (ICs), two grounded capacitors, and five resistors. Both proposed architectures also feature one high-impedance input port and three low-impedance output ports for easy connection to other VM configurations without the need for VM buffers. The two proposed VM LT1228-based second-order multifunction filters simultaneously provide BP, LP, and HP filter transfer functions at Vo1, Vo2, and Vo3 output terminals. The pole angular frequencies and the quality factors of the two proposed VM LT1228-based second-order multifunction filters can be electronically and orthogonally adjusted by the bias currents from their corresponding commercial LT1228 ICs, and can be independently adjusted in special cases. In addition, both proposed VM LT1228-based second-order multifunction filters have two independent gain-controlled BP and LP filter transfer functions at Vo4 and Vo5 output terminals, respectively. Based on the three commercial LT1228 ICs and several passive components, simulations and experimental measurements are provided to verify the theoretical predictions and demonstrate the performance of the two proposed high-input impedance electronically tunable VM LT1228-based second-order multifunction filters. The measured input 1-dB power gain compression point (P1dB), third-order IMD (IMD3), third-order intercept (TOI) point, and spurious-free dynamic range (SFDR) of the first proposed filter were −7.1 dBm, −48.84 dBc, 4.133 dBm, and 45.02 dBc, respectively. The measured input P1dB, IMD3, TOI, and SFDR of the second proposed filter were −7 dBm, −49.65 dBc, 4.316 dBm, and 45.88 dBc, respectively. Both proposed filters use a topology synthesis method based on the VM second-order non-inverting/inverting HP filter transfer functions to generate the BP, LP and HP filter transfer functions simultaneously, making them suitable for applications in three-way crossover networks.

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Three new CFOA-based SIMO-type universal active filter configurations with unrivalled features

Cited by 12 publications

References 47 publications

Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

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

Synthesis of High-Input Impedance Electronically Tunable Voltage-Mode Second-Order Low-Pass, Band-Pass, and High-Pass Filters Based on LT1228 Integrated Circuits

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