A compact subthreshold CMOS 2&lt;sup&gt;nd&lt;/sup&gt;-order g&lt;inf&gt;m&lt;/inf&gt;-C lowpass filter

Sawigun, Chutham; Pawarangkoon, P.

doi:10.1109/ecticon.2015.7207054

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…The filter with a high dynamic range (DR) of 91.86 dB is the best when compared to other filters found in the literature. To compare the performance of the proposed filter with other filters, figure-of-merit (FoM) [26,27] is used FoM = Power Order × f c × Dynamic range (16) It can be clearly seen that, with its energy efficiency (FoM), the proposed filter stands as one of the best candidates for biomedical signal processing.…”

Section: Simulation Resultsmentioning

confidence: 99%

1.8 V, 25.9 nW, 91.86 dB dynamic range second‐order lowpass filter tunable in the range 4–100 Hz

Reddy

Laxminidhi

2019

IET Circuits, Devices & Systems

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A second-order lowpass Butterworth filter with tunable bandwidth capable of offering a dynamic range of 91.86 dB operating on a supply voltage of 1.8 V is presented. The proposed filter is based on a sub-threshold source follower. The transistor bias currents are switched to enable the bandwidth tuning in the range 4-100 Hz. A proportional to absolute temperature (PTAT) current reference circuit helps to keep the bandwidth intact across process, voltage and temperature variations. The filter, designed in 0.18 µm standard CMOS process, consumes 25.9 nW making it a potential candidate for portable biomedical applications.

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Section: Simulation Resultsmentioning

confidence: 99%

1.8 V, 25.9 nW, 91.86 dB dynamic range second‐order lowpass filter tunable in the range 4–100 Hz

Reddy

Laxminidhi

2019

IET Circuits, Devices & Systems

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Section: Introductionmentioning

confidence: 99%

“…Although the results are acceptable, the minimum supply voltage is still limited by the threshold voltage of MOS transistors. However, very lowvoltage circuits can operate from supply voltages lower than the threshold voltage by biasing the MOS transistor in a weak inversion region[7][8][9][10].Nevertheless, even for circuits operating in weak inversion, the voltage swing is limited by VGS voltages of MOS transistors. To overcome the above mentioned constrains, the so-called bulk-driven technique was introduced[11][12].…”

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confidence: 99%

MIOTA-Based Filters for Noise and Motion Artifact Reductions in Biosignal Acquisition

2022

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This paragraph of the first footnote will contain support information, including sponsor and financial support acknowledgment. For example, "This work was supported in part by KMITL funding."ABSTRACTThis paper presents a new low-voltage CMOS structure for operational transconductance amplifier (OTA) exploiting the bulk-driven, the self-cascode and the multiple-input transistor techniques (MI). The multiple-input OTA (MIOTA) circuit operates in subthreshold region using 0.5V supply voltage and offers enhanced linearity. The MIOTA is developed for biopotential signal as well as electrocardiogram (ECG) signal processing circuit and it is exploited to design a 5th-order Chebyshev low-pass and 3rd-order band-pass filters with a dynamic range (DR) of 57.6 dB and 60.4 dB, and nanopower consumption of 50 nW and 60 nW, respectively. Due to the electronic tuning of cut-off frequency, the low-pass and band-pass filters are suitable for random noise and motion artifact noise reductions in biopotential signals. The circuits were designed in Cadence environment using the standard N-well 0.18 µm TSMC CMOS technology. Intensive post-layout simulation results along with the process, voltage, temperature analysis (PVT) and Monte Carlo (MC) prove the robustness of the design. The chip area of the proposed MIOTA is 0.00725 mm 2 (118µm×61.5 µm). Compared with standard OTA the MIOTA offers simplification of filter topology and reduced number of active elements. In order to demonstrate these advantages, the MIOTA-based filter was also build using commercially available OTA LT1228. The experimental results of OTA LT1228 confirm both the filter functionality and the advantages of the proposed MIOTA.INDEX TERMSBulk-driven, low-pass filter, band-pass filter, low power, low voltage, multiple input operational transconductance amplifier.

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A compact subthreshold CMOS 2<sup>nd</sup>-order g<inf>m</inf>-C lowpass filter

Cited by 2 publications

References 7 publications

1.8 V, 25.9 nW, 91.86 dB dynamic range second‐order lowpass filter tunable in the range 4–100 Hz

1.8 V, 25.9 nW, 91.86 dB dynamic range second‐order lowpass filter tunable in the range 4–100 Hz

MIOTA-Based Filters for Noise and Motion Artifact Reductions in Biosignal Acquisition

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