Design and realization of large dynamic range low pass filter with wide tuneable cut-off bandwidth

This article presents a wideband reconfigurable integrated low-pass filter (LPF) for 5G NR compatible software-defined radio (SDR) solutions. The filter uses Active-RC topology to achieve high linearity performance. Its bandwidth can be tuned from 2.5 MHz to 200 MHz, which corresponds to a tuning ratio of 92.8. The order of the filter can be changed between the 2nd, 4th, or 6th order; it has built-in process, voltage, and temperature (PVT) compensation with a tuning range of ±42%; and power management features for optimization of the filter performance across its entire range of bandwidth tuning. Across its entire order, bandwidth, and power configuration range, the filter achieves in-band input-referred third-order intercept point (IIP3) between 32.7 dBm and 45.8 dBm, spurious free dynamic range (SFDR) between 63.6 dB and 79.5 dB, 1 dB compression point (P1dB) between 9.9 dBm and 14.1 dBm, total harmonic distortion (THD) between −85.6 dB and −64.5 dB, noise figure (NF) between 25.9 dB and 31.8 dB and power dissipation between 1.19 mW and 73.4 mW. The LPF was designed and verified using 65 nm CMOS process; it occupies a 0.429 mm2 area of silicon and uses a 1.2 V supply.

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A CMOS Low Pass Filter for SoC Lock-in-Based Measurement Devices

Sensors ◽

10.3390/s19235173 ◽

2019 ◽

Vol 19 (23) ◽

pp. 5173 ◽

Cited By ~ 2

Author(s):

Jorge Pérez-Bailón ◽

Belén Calvo ◽

Nicolás Medrano

Keyword(s):

Dynamic Range ◽

Current Trend ◽

Cutoff Frequency ◽

Oxide Semiconductor ◽

Constant Current ◽

Pass Filter ◽

Low Pass Filter ◽

Compact Size ◽

Low Pass ◽

Lock In

This paper presents a fully integrated Gm–C low pass filter (LPF) based on a current steering Gm reduction-tuning technique, specifically designed to operate as the output stage of a SoC lock-in amplifier. To validate this proposal, a first-order and a second-order single-ended topology were integrated into a 1.8 V to 0.18 µm CMOS (Complementary Metal-Oxide-Semiconductor) process, showing experimentally a tuneable cutoff frequency that spanned five orders of magnitude, from tens of mHz to kHz, with a constant current consumption (below 3 µA/pole), compact size (<0.0140 mm2/pole), and a dynamic range better than 70 dB. Compared to state-of-the-art solutions, the proposed approach exhibited very competitive performances while simultaneously fully satisfying the demanding requirements of on-chip portable measurement systems in terms of highly efficient area and power. This is of special relevance, taking into account the current trend towards multichannel instruments to process sensor arrays, as the total area and power consumption will be proportional to the number of channels.

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0.5 V Fifth-Order Butterworth Low-Pass Filter Using Multiple-Input OTA for ECG Applications

Sensors ◽

10.3390/s20247343 ◽

2020 ◽

Vol 20 (24) ◽

pp. 7343

Author(s):

Montree Kumngern ◽

Nattharinee Aupithak ◽

Fabian Khateb ◽

Tomasz Kulej

Keyword(s):

Power Consumption ◽

Dynamic Range ◽

Oxide Semiconductor ◽

Cmos Process ◽

Subthreshold Region ◽

Pass Filter ◽

Low Pass Filter ◽

Multiple Input ◽

Low Pass ◽

Fifth Order

This paper presents a 0.5 V fifth-order Butterworth low-pass filter based on multiple-input operational transconductance amplifiers (OTA). The filter is designed for electrocardiogram (ECG) acquisition systems and operates in the subthreshold region with nano-watt power consumption. The used multiple-input technique simplifies the overall structure of the OTA and reduces the number of active elements needed to realize the filter. The filter was designed and simulated in the Cadence environment using a 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) process from Taiwan Semiconductor Manufacturing Company (TSMC). Simulation results show that the filter has a bandwidth of 250 Hz, a power consumption of 34.65 nW, a dynamic range of 63.24 dB, attaining a figure-of-merit of 0.0191 pJ. The corner (process, voltage, temperature: PVT) and Monte Carlo (MC) analyses are included to prove the robustness of the filter.

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A Low Pass Filter With sub-Hz Cutoff Frequencies for a Portable On-Chip Lock-in Microinstrument

Jornada de Jóvenes Investigadores del I3A ◽

10.26754/jji-i3a.201802744 ◽

2018 ◽

Vol 6 ◽

Author(s):

Jorge Pérez Bailón ◽

Belén Calvo ◽

Nicolás Medrano

Keyword(s):

Dynamic Range ◽

Output Stage ◽

Pass Filter ◽

Low Pass Filter ◽

Fully Integrated ◽

Cutoff Frequencies ◽

Compact Size ◽

Low Pass ◽

On Chip ◽

Lock In

This paper presents a first-order single-ended fully-integrated Low Pass Filter (LPF) tunable from 114 mHz to 2.5 kHz, designed to conform the output stage of a portable lock-in amplifier requiring fc = 0.5 Hz, 5 Hz cutoff frequencies. It achieves the two target fc over a -40 to 120 °C range with a power consumption of 2.7 μW at 1.8 V supply, compact size and dynamic range above 80 dB.

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91dB Dynamic Range 9.5nW Low Pass Filter for Bio-Medical Applications

2018 IEEE Computer Society Annual Symposium on VLSI (ISVLSI) ◽

10.1109/isvlsi.2018.00088 ◽

2018 ◽

Author(s):

Jayaram Reddy M.K. ◽

Sreenivasulu Polineni ◽

Laxminidhi Tonse

Keyword(s):

Dynamic Range ◽

Medical Applications ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

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A 60-dB dynamic-range CMOS sixth-order 2.4-Hz low-pass filter for medical applications

IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing ◽

10.1109/82.899631 ◽

2000 ◽

Vol 47 (12) ◽

pp. 1391-1398 ◽

Cited By ~ 162

Author(s):

S. Solis-Bustos ◽

J. Silva-Martinez ◽

F. Maloberti ◽

E. Sanchez-Sinencio

Keyword(s):

Dynamic Range ◽

Sixth Order ◽

Medical Applications ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

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Low-Contrast Blurry Image Enhancement Based on Human Visual Property and Generalized Fuzzy Operator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.135-136.597 ◽

2011 ◽

Vol 135-136 ◽

pp. 597-601

Author(s):

Hui Feng Wang ◽

Pan Zhi Liu

Keyword(s):

Dynamic Range ◽

Local Contrast ◽

Pass Filter ◽

Low Pass Filter ◽

Low Contrast ◽

Adaptive Enhancement ◽

Low Pass ◽

Blurred Image ◽

Image Edges ◽

Visual Properties

On the basis of generalized fuzzy set theory, local contrast enhancement and human visual properties, a kind of adaptive enhancement technique presented. In this technique, first, a orthotropic Prewitt operator act on the original image, and then a normalization grads image can be obtained, second, we get the blurred image through a real-time low-pass filter such as Butterworth or Wavelet filter. At last we design a enhancement function based on a-tan function with the blurred image and grads image as input. And the gray image is translated to correspondent general membership function by using the a-tan mapping. The method can not only improve dynamic range, but also enhance the local contrast in the different gray levels with more image edges and details. Its efficiency and superiority are clarified by experiment.

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