DVCC+ based multifunction and universal filters with the high input impedance features

Alpaslan, Halil; Yüce, Erkan

doi:10.1007/s10470-020-01643-8

Cited by 13 publications

(22 citation statements)

References 29 publications

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“…Equations ( 7) and (8) indicate that the ω 0 and BW (or the Q in Equation ( 9)) are orthogonally controlled. In a practical design to get the required natural frequency and bandwidth, the natural frequency must be first designed by setting the g m1 , R 1 , C 1 and C 2 .…”

Section: The Universal Biquad Filter Based On Vdddasmentioning

confidence: 99%

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Universal Filter Based on Compact CMOS Structure of VDDDA

Jaikla

Khateb

Kulej

et al. 2021

Sensors

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This paper proposes the simulated and experimental results of a universal filter using the voltage differencing differential difference amplifier (VDDDA). Unlike the previous complementary metal oxide semiconductor (CMOS) structures of VDDDA that is present in the literature, the present one is compact and simple, owing to the employment of the multiple-input metal oxide semiconductor (MOS) transistor technique. The presented filter employs two VDDDAs, one resistor and two grounded capacitors, and it offers low-pass: LP, band-pass: BP, band-reject: BR, high-pass: HP and all-pass: AP responses with a unity passband voltage gain. The proposed universal voltage mode filter has high input impedances and low output impedance. The natural frequency and bandwidth are orthogonally controlled by using separated transconductance without affecting the passband voltage gain. For a BP filter, the root mean square (RMS) of the equivalent output noise is 46 µV, and the third intermodulation distortion (IMD3) is −49.5 dB for an input signal with a peak-to peak of 600 mV, which results in a dynamic range (DR) of 73.2 dB. The filter was designed and simulated in the Cadence environment using a 0.18-µm CMOS process from Taiwan semiconductor manufacturing company (TSMC). In addition, the experimental results were obtained by using the available commercial components LM13700 and AD830. The simulation results are in agreement with the experimental one that confirmed the advantages of the filter.

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Section: The Universal Biquad Filter Based On Vdddasmentioning

confidence: 99%

“…The versatile biquad filter that gives multiple filtering functions within the same configuration is well-known as the universal or multifunction filter. In the open literature, this type of active filter has been proposed continuously [ 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Universal Filter Based on Compact CMOS Structure of VDDDA

Jaikla

Khateb

Kulej

et al. 2021

Sensors

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“…The measured value of the third-order IMD (IMD3) is about −50.83 dBc, and the measured value of the third-order intercept (TOI) point is about 5.136 dBm. The figure-of-merit (FoM) of the biquad was defined as [14]:…”

Section: The Electronically Tunable Vm Biquadmentioning

confidence: 99%

“…With increasing emphasis on voltage-mode (VM) biquads and oscillators, there is still a need to develop active components for VM biquads and oscillators. Oscillators [1][2][3][4][5][6] and biquads [7][8][9][10][11][12][13][14] are the most crucial circuit blocks in numerous applications, such as electronic communications, signal processing systems, and measurement systems. Especially in communication modulation systems, the sinusoidal oscillator is utilized to generate the carrier signals for amplitude modulation (AM) and amplitude shift keying (ASK) modulation.…”

Section: Introductionmentioning

confidence: 99%

Design and Experiment of Electronically Tunable Voltage-Mode Biquad and Output Current Amplitude Oscillator

Wang

Chen

et al. 2021

Applied Sciences

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This study presents an electronically tunable configuration for the design of a voltage-mode (VM) biquad with four input terminals and three output terminals. The proposed circuit employs four operational transconductance amplifiers (OTAs) and two grounded capacitors. Depending on the selections of the four input voltage signals, all the standard filtering functions can be realized. The proposed configuration simultaneously provides VM inverting band-pass, non-inverting low-pass, and non-inverting band-reject filtering functions without any component-matching choices. It offers the features of a resistorless structure, high-input impedance, electronic control of the pole frequency and quality factor, and low active and passive sensitivities. The measured power dissipation of the biquad is 0.96 W under 32 mA constant output current. The measured 1 dB power gain compression point of the output inverting band-pass filter is −7 dBm. The measured value of the third-order intercept point is 5.136 dBm, and the measured value of the third-order intermodulation distortion is −50.83 dBc. Moreover, the measured value of the spurious-free dynamic range is 53.49 dB, and the figure-of-merit of the biquad is 268.75 × 103. In addition, an electronically controllable quadrature oscillator (QO) with amplitude of output current can be realized using the proposed biquad. The proposed electronically controllable QO can provide an amplitude modulation signal or an amplitude shift keying signal, and is widely applied in signal processing systems and electronic communication systems. PSpice simulations and experimental results are accomplished.

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“…The choice of active building blocks (ABBs) plays an important role in analog filter design because one expects VM second-order multifunction filters with high input and low output impedances to allow cascading of the VM circuits. Therefore, many circuit architecture studies use different high-performance ABBs to implement different kinds of filters and oscillators [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. In [ 22 ], a high-input impedance VM second-order filter based on four second-generation current conveyor (CCII) active components and six passive components is proposed.…”

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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DVCC+ based multifunction and universal filters with the high input impedance features

Cited by 13 publications

References 29 publications

Universal Filter Based on Compact CMOS Structure of VDDDA

Universal Filter Based on Compact CMOS Structure of VDDDA

Design and Experiment of Electronically Tunable Voltage-Mode Biquad and Output Current Amplitude Oscillator

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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