Design and simulation of fourth order low-pass Gm-C filter with novel auto-tuning circuit in 90 nm CMOS

Abdolmaleki, Mohammad; Dousti, Massoud; Tavakoli, Mohammad Bagher

doi:10.1007/s10470-020-01785-9

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…As discussed above, the target control word m TAGT satisfies Equation (14), which means the value of m TAGT is higher than m x and lower than m y . The mean value of m x and m y could be an approximation of m TAGT :…”

Section: Symmetric Comparison Techniquementioning

confidence: 97%

“…As a result, RC time constant uncertainty of up to 50% could occur due to variations in process, voltage, and temperature (PVT); this uncertainty will reduce the frequency performance of filters, leading to reliability issues in integrated circuits [ 5 , 6 , 7 , 8 , 9 , 10 ]. Accordingly, many real-time on-chip automatic tuning methods have been proposed and developed to improve the accuracy in the calibration of the RC time constant [ 2 , 6 , 11 , 12 , 13 , 14 , 15 ]. However, most existing methods are limited by some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…However, most existing methods are limited by some disadvantages. In [ 11 , 12 , 13 , 14 , 16 ], the linearity in the circuit to be tuned is compromised. In fact, high linearity is often very important in many cases [ 15 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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A High-Accuracy RC Time Constant Auto-Tuning Scheme for Integrated Continuous-Time Filters

Jin,

Wu,

Yin

et al. 2024

Micromachines

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The reliability of the resistor-capacitor (RC) time constant of a continuous-time (CT) filter has long been an obstacle with integrated circuits. Due to process and temperature variations in complementary metal-oxide semiconductor (CMOS) technology, the absolute value of the RC time constant may vary over ±50%, which is a big issue for many integrated continuous-time analog circuits. This study proposes an on-chip RC time constant auto-tuning scheme. The proposed scheme is based on the discrete master–slave auto-tuning concept. Considering the limitations in conventional works, a higher tuning accuracy is achieved by adopting two techniques: firstly, parasitic capacitance cancelation is proposed to eliminate the effects caused by parasitic capacitance; secondly, symmetric comparison is introduced to minimize the influence of the DC offset of the comparator. A successive approximation procedure is applied to improve the tuning speed. The proposed auto-tuning scheme has been validated in 55 nm CMOS technology with a fourth-order active-RC low-pass filter under PVT variations and 60 mV input offset voltage. The average tuning error is 2.21%, and the maximum error is 3.67%. The tuning error of the proposed scheme is considerably lower than the conventional scheme.

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Section: Symmetric Comparison Techniquementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A High-Accuracy RC Time Constant Auto-Tuning Scheme for Integrated Continuous-Time Filters

Jin,

Wu,

Yin

et al. 2024

Micromachines

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show abstract

“…In fact, the extensive demand for better filter design has led to the theoretical development of electronic circuits in recent years. The techniques for filtering human body vital signals have been the subject of extensive research in recent decades, specifically in biomedical applications [1]- [8]. The amplitude and phase properties of circuit input signals are modified or adjusted by filters, which are essentially two-part networks.…”

Section: Introductionmentioning

confidence: 99%

A Highly Tunable Ultra-Low Cut-Off Frequency gm-c Filter with Bandwidth Stabilization Technique

Sasan,

Baghtash

2023

Preprint

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In this paper, an efficient technique for stabilizing the bandwidth of low-bandwidth biomedical gm-c filters is proposed. Using this technique, the bandwidth of the filter becomes much less dependent on the circuit elements’ variations due to temperature or process, and thus the filter can be tuned more effectively and accurately. First, with circuit analysis, the reason for the dependency of the bandwidth on the circuit components is extracted. Then, an efficient circuit is proposed to reduce this dependency. The proposed 4th order gm-c filter has a symmetrical structure, and designed in TSMC 180 nm CMOS technology with bandwidth of 50 mHZ to 20 Hz, power consumption of 0.73 µW. Finally, using mathematical relationships and circuit simulations, the effectiveness of the proposed filter is proven.

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A New Ultra-Low-Power High-Order Universal OTA-C Filter Based on CMOS Double Inverters in the Subthreshold Region

Namdari,

Dolatshahi,

Aghababaei Horestani

2023

Circuits Syst Signal Process

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Design and simulation of fourth order low-pass Gm-C filter with novel auto-tuning circuit in 90 nm CMOS

Cited by 9 publications

References 19 publications

A High-Accuracy RC Time Constant Auto-Tuning Scheme for Integrated Continuous-Time Filters

A High-Accuracy RC Time Constant Auto-Tuning Scheme for Integrated Continuous-Time Filters

A Highly Tunable Ultra-Low Cut-Off Frequency gm-c Filter with Bandwidth Stabilization Technique

A New Ultra-Low-Power High-Order Universal OTA-C Filter Based on CMOS Double Inverters in the Subthreshold Region

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