High Quality-Factor Shadow Bandpass Filters with Orthogonality to the Characteristic Frequency

Buakaew, Seangrawee; Narksarp, Wipavan; Wongtaychatham, Chariya

doi:10.1109/ecti-con49241.2020.9158304

Cited by 6 publications

(11 citation statements)

References 9 publications

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“…Finally, Table 2 provides a comparison of the proposed filters with previously published shadow filters in [ 22 , 23 , 26 , 29 , 30 ]. The proposed filters provide lower power consumption, as compared with [ 22 , 23 ], lower output impedance, as compared with [ 26 , 30 ] (except the output impedance of the LP filter in Figure 3 b), larger number of low-impedance nodes, as compared with [ 29 ], and lower supply voltage, as compared with [ 23 , 26 , 29 , 30 ].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…There are many shadow filters (also known as frequency-agile filters) realized using variant active elements available in the literature [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. In [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ], current-mode (CM) shadow filters have been reported whereas in [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] voltage-mode (VM) shadow filters have been introduced. This paper is focused on the VM filters which offer high-input and low-output impedances, electronic tuning ability, and use grounded passive components.…”

Section: Introductionmentioning

confidence: 99%

“…However, the circuits in [ 19 , 20 , 21 , 22 ] don’t provide an electronic tuning ability of the natural frequency and the quality factor. The shadow filters employing voltage differencing transconductance amplifier (VDTA) [ 23 , 24 , 25 , 26 , 27 ], voltage differencing gain amplifier (VDGA) [ 28 ], voltage differencing differential difference amplifier (VDDDA) [ 29 ], and operational transconductance amplifier (OTA) [ 30 ] offer an electronic tuning ability and high-input impedance, which is advantageous for VM circuits. However, these active filters were supplied with relatively high voltages, namely, ±0.9 V in [ 23 , 29 ], ±1 V in [ 24 , 25 , 27 ], ±1.5 V in [ 26 ], and ±1.8 V in [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

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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: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

Kumngern

Khateb

Kulej

2023

Sensors

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“…The system that is suitable for realizing MISO shadow filters has been proposed in [23]. Based on the systems in [20][21][22][23], several shadow filters of agile filters have been proposed based on current-mode approaches [24][25][26][27][28][29][30][31] and voltage-mode approaches [32][33][34][35][36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

0.5 V Multiple-Input Multiple-Output Differential Difference Transconductance Amplifier and Its Applications to Shadow Filter and Oscillator

et al. 2023

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This paper presents new applications of low-voltage and low-power multiple-input multipleoutput differential difference transconductance amplifier (DDTA). The multiple-input bulk-driven MOS transistor (MIBD MOST) technique provides multiple-input of the active device that simplifies the application's topology and reduces its power consumption. The proposed DDTA has been used to realize multiple-input single-output shadow filter. Both voltage-and transimpedance-mode filtering functions can be obtained. The natural frequency and the quality factor of the shadow filter can be independently and electronically controlled using DDTA-based amplifiers. The proposed shadow filter has been modified to work as a shadow oscillator. The condition and frequency of oscillation can be controlled independently and electronically. The DDTA is capable to work with 0.5V supply voltage and consumes 218.2 nW. The applications have been designed and simulated in Cadence using 0.18µm TSMC CMOS technology.INDEX TERMS differential difference transconductance amplifier (DDTA), shadow filter, shadow oscillator, analog filter, low-voltage, low-power CMOS

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“…The natural frequency and the quality factor of shadow filters can thus be controlled by external amplifiers. There are many shadow filters using various active devices available in literature, such as the current-feedback operational-amplifier (CFOA) in [ 3 ], current differencing transconductance amplifier (CDTA) in [ 4 , 5 ], operational floating current conveyor (OFCC) in [ 6 ], differential difference current conveyor (DDCC) in [ 7 ], voltage differencing differential difference amplifier (VDDDA) in [ 8 ], and voltage differencing transconductance amplifiers (VDTAs) in [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

0.5-V Nano-Power Shadow Sinusoidal Oscillator Using Bulk-Driven Multiple-Input Operational Transconductance Amplifier

Khateb

Kumngern

Kulej

et al. 2023

Sensors

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This paper presents a low-frequency shadow sinusoidal oscillator using a bulk-driven multiple-input operational transconductance amplifier (MI-OTA) with extremely low-voltage supply and nano-power consumption. The proposed oscillator is composed using two-input single-output biquad filter and amplifiers. The condition and the frequency of oscillation of the shadow oscillator can be controlled electronically and independently using amplifiers. The circuit is designed in Cadence program using 0.18 µm CMOS technology from TSMC. The voltage supply is 0.5 V and the power consumption of the oscillator is 54 nW. The total harmonic distortion (THD) of the output signals is around 0.3% for 202 Hz. The simulation results are in accordance with theory.

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High Quality-Factor Shadow Bandpass Filters with Orthogonality to the Characteristic Frequency

Cited by 6 publications

References 9 publications

Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers

0.5 V Multiple-Input Multiple-Output Differential Difference Transconductance Amplifier and Its Applications to Shadow Filter and Oscillator

0.5-V Nano-Power Shadow Sinusoidal Oscillator Using Bulk-Driven Multiple-Input Operational Transconductance Amplifier

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