A Differential Sallen-Key Low-Pass Filter in Amorphous-Silicon Technology

Wu, Chien-Han; Hsieh, Hsieh-Hung; Ku, Pei-Cheng; Lu, Liang-Hung

doi:10.1109/jdt.2010.2044631

Cited by 19 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is true for the low‐gain DDA with diode‐connected load, which consumes less power when compared with the high‐gain DDA. It should be noticed that the last column in this table has presented simulation results from Wu et al for a fair comparison with the current work. It can be inferred from the table that power consumption has been reduced as compared with prior art.…”

Section: Resultsmentioning

confidence: 96%

“…As a consequence, circuits should be designed only with n‐type transistors, and CMOS design techniques cannot be adapted directly. Nevertheless, many analog and digital circuits, mixed‐signal, and signal processing blocks have been reported.…”

Section: Inroductionmentioning

confidence: 99%

“…Nevertheless, an RC biquad was demonstrated using a‐Si: H TFTs with a power supply of 25 V. Then this paper presents a sixth‐order fully differential Sallen‐Key low‐pass filter, for the first time with oxide TFTs, whose performance is compared with an active RC filter implementation. These sixth‐order filters have been implemented by cascading three biquads, which were realized using both low‐gain and high‐gain differential amplifiers.…”

Section: Inroductionmentioning

confidence: 99%

See 2 more Smart Citations

Sixth‐order differential Sallen‐and‐Key switched capacitor LPF using a‐IGZO TFTs

Wadhwa

Bahubalindruni

Chapagai

et al. 2018

Circuit Theory & Apps

View full text Add to dashboard Cite

This paper presents sixth-order fully differential active low pass RC and switched-capacitor (SC) filters using N-type IGZO thin-film transistors for flexible wearable continuous health monitoring systems. As a first step, a low-gain amplifier using a diode-connected load and a fully differential amplifier is designed with positive feedback based on capacitor bootstrapping. These amplifiers present a gain around 5.03 and 40 dB, respectively, whereas their respective GBW product are around 450 and 200 kHz. Then these amplifiers are employed to realize biquads, with which a sixth-order Sallen-Key lowpass RC and SC filters are implemented. The SC filter realized with low-gain DDA has shown a simulated THD of −30.9 dB, SFDR of 30.1 dB, and a power consumption of 456 μW. On the other hand, the SC filter presents a THD of −31.4 dB, SFDR of 32.2 dB, and a power consumption of 573 μW with highgain differential difference amplifier (DDA) when a power supply of 10 V is used. Circuit simulations have been carried out in Cadence Virtuoso using in-house IGZO TFT models. KEYWORDSactive RC filters, differential amplifier and health monitoring system, IGZO TFT, switched capacitor filters 1 | INRODUCTION Continuous health monitoring of post hospitalized cardiac patients is vital. In present scenario, most of the cardio vascular system activities are being monitored using ECG and BP measurements using cuffs, which limit the mobility of the patients and need human interaction. Nevertheless, few wearable devices were reported with standard CMOS technology, 1-4 where these systems are bulky (due to the battery weight), rigid, and expensive. In order to get rid of these drawbacks and to guarantee user comfort, biomedical self-contained wearable systems implemented with low-cost flexible electronics would be a perfect solution, where circuits can be driven by printed batteries. 5,6 Among other semiconductor technologies (a-Si: H TFT and organic TFT) that allow flexible electronics due to compatibility with low-temperature fabrication (≥150°C), 7,8 amorphous indium gallium zinc oxide thin-film transistors

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Inroductionmentioning

confidence: 99%

Section: Inroductionmentioning

confidence: 99%

See 1 more Smart Citation

Sixth‐order differential Sallen‐and‐Key switched capacitor LPF using a‐IGZO TFTs

Wadhwa

Bahubalindruni

Chapagai

et al. 2018

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…Low-pass filters (LPFs) are important functional blocks in biomedical wearable devices. Though significant work is reported for circuit design using oxide TFTs [5][6][7], the work done towards filter implementation is scarce [8,9]. While [8] focus on resistor capacitor (RC) filter using a-Si:H TFTs with poor cutoff frequency and high-power consumption, reference [9] limited to only simulation results.…”

mentioning

confidence: 99%

“…Though significant work is reported for circuit design using oxide TFTs [5][6][7], the work done towards filter implementation is scarce [8,9]. While [8] focus on resistor capacitor (RC) filter using a-Si:H TFTs with poor cutoff frequency and high-power consumption, reference [9] limited to only simulation results. Switched capacitor (SC)-based filters are typically robust against process variations as the cutoff frequency is a function of tracking capacitance, unlike RC counterparts.…”

mentioning

confidence: 99%

Switched capacitor low‐pass filter with amorphous indium‐gallium‐zinc‐oxide thin‐film transistors on flexible substrate

Wadhwa

Bahubalindruni

Pedda

et al. 2021

Electronics Letters

View full text Add to dashboard Cite

This paper presents a novel switched capacitor biquad with a high gain differential amplifier for the first time using amorphous indium‐gallium‐zinc‐oxide thin‐film transistors on flexible (polyimide) substrate. The proposed low‐pass filter was successfully characterised under normal ambient conditions. The circuit has shown a 3‐dB cutoff frequency of 155 Hz and power consumption of 336 μW from measurements with a power supply voltage of 10 V. This circuit would find potential applications in wearable continuous health monitoring systems.

show abstract

A phase-locked loop frequency tracking system for portable microelectromechanical piezoresistive cantilever mass sensors

et al. 2013

View full text Add to dashboard Cite

A Differential Sallen-Key Low-Pass Filter in Amorphous-Silicon Technology

Cited by 19 publications

References 3 publications

Sixth‐order differential Sallen‐and‐Key switched capacitor LPF using a‐IGZO TFTs

Sixth‐order differential Sallen‐and‐Key switched capacitor LPF using a‐IGZO TFTs

Switched capacitor low‐pass filter with amorphous indium‐gallium‐zinc‐oxide thin‐film transistors on flexible substrate

A phase-locked loop frequency tracking system for portable microelectromechanical piezoresistive cantilever mass sensors

Contact Info

Product

Resources

About