A 1.9 nW, Sub-1 V, 542 pA/V Linear Bulk-Driven OTA with 154 dB CMRR for Bio-Sensing Applications

Silva, Rafael Sanchotene; Rodovalho, Luis Henrique; Aiello, Orazio; Rodrigues, Cesar Ramos

doi:10.3390/jlpea11040040

Cited by 13 publications

(6 citation statements)

References 48 publications

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“…Recent years have seen a growing diffusion of electronic systems for portable biomedical applications [1][2][3][4][5], smart sensors [6][7][8][9] and, in general, for applications in the field of the Internet of Things (IoT) [10][11][12]. These systems are usually powered by batteries or by energy harvested from the environment: this requires minimizing not only the power dissipation, to extend the battery life, but also the supply voltage, because energy harvesting systems are able to provide voltages in the hundreds of mV range [13].…”

Section: Introductionmentioning

confidence: 99%

A Differential-to-Single-Ended Converter Based on Enhanced Body-Driven Current Mirrors Targeting Ultra-Low-Voltage OTAs

et al. 2022

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In this work, an ultra-low-voltage (ULV) technique to improve body-driven current mirrors is proposed. The proposed technique is employed to improve the performance of conventional differential-to-single-ended (D2S) converters which at these low voltages suffer from a low common-mode rejection ratio (CMRR). In addition, the technique aims to improve the performance of the conventional D2S also under a large signal swing and with respect to the process, voltage and temperature (PVT) variations, resulting in a very low distortion, high current mirror accuracy and robust performance. An enhanced body-driven current mirror was designed in a 130nm CMOS technology from STMicroelectronics and an exhaustive campaign of simulations was conducted to confirm the effectiveness of the strategy and the robustness of the results. The enhanced D2S was also employed to design a ULV operational transconductance amplifier (OTA) and a comparison with an OTA based on a conventional D2S was provided. The simulation results have shown that the proposed enhanced D2S allows achieving the ULV OTAs with a CMRR and a PSRR which are 18 and 9 dB higher than the ones obtained with the conventional D2S topology, respectively. Moreover, the linearity performance is also improved as shown by the THD, whose value is decreased of about 5 dB.

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Section: Introductionmentioning

confidence: 99%

A Differential-to-Single-Ended Converter Based on Enhanced Body-Driven Current Mirrors Targeting Ultra-Low-Voltage OTAs

et al. 2022

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“…Recent years have seen a growing interest in ultra-low-voltage operational transconductance amplifiers (OTAs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] that are a key building block in many analog and mixed-signal applications such as Internet-of-Things (IoT) and biomedical ones [19][20][21][22]. This is a strong incentive to innovate the design flow of analog blocks: even if they often constitute just a small fraction of a mixed-signal system, their design requires a large fraction of the overall effort.…”

Section: Introductionmentioning

confidence: 99%

A Standard-Cell-Based CMFB for Fully Synthesizable OTAs

Centurelli

Sala

Scotti

2022

JLPEA

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In this paper, we propose a fully standard-cell-based common-mode feedback (CMFB) loop with an explicit voltage reference to improve the CMRR of pseudo-differential standard-cell-based amplifiers and to stabilize the dc output voltage. This latter feature allows robust biasing of operational transconductance amplifiers (OTAs) based on a cascade of such stages. A detailed analysis of the CMFB is reported to both provide insight into circuit behavior and to derive useful design guidelines. The proposed CMFB is then exploited to build a fully standard-cell OTA suitable for automatic place and route. Simulation results referring to the standard-cell library of a commercial 130 nm CMOS process illustrated a differential gain of 28.3 dB with a gain-bandwidth product of 15.4 MHz when driving a 1.5 pF load capacitance. The OTA exhibits good robustness under PVT and mismatch variations and achieves state-of-the-art FOMs also thanks to the limited area footprint.

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“…1 Such devices allow banking operations, mail-checking, and travel-booking services, which are user-friendly and easily accessible. Furthermore, wearable devices and modern remote sensors [2][3][4] have drastically changed the study and treatment of medical pathologies, [5][6][7] which can now be remotely monitored and diagnosed. As a consequence, the ever-increasing popularity of smart systems has motivated researchers to develop ultra-low-power (ULP) and ultralow-voltage (ULV) electronic devices.…”

Section: Introductionmentioning

confidence: 99%

A body‐driven rail‐to‐rail 0.3 V operational transconductance amplifier exploiting current gain stages

Sala

Centurelli

Monsurrò

et al. 2022

Circuit Theory & Apps

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This paper presents a novel topology of ultra-low voltage (ULV) operational transconductance amplifier (OTA), which exploits several design techniques to achieve high efficiency, symmetrical slew rate, good linearity, and robustness in spite of ultra-low voltage operation. Simulations in a commercial 130-nm CMOS technology with 0.3-V supply voltage show the best reported small-signal figure-of-merit among 0.3-V OTAs, with a dc gain of 56.2 dB, a unity-gain frequency of 26.2 kHz over a 150-pF load capacitor, and a power consumption of 139.5 nW. A symmetrical slew rate of about 3.2 V/ms is achieved, and results are consistent under process, supply voltage and temperature variations, and device mismatches.

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A 1.9 nW, Sub-1 V, 542 pA/V Linear Bulk-Driven OTA with 154 dB CMRR for Bio-Sensing Applications

Cited by 13 publications

References 48 publications

A Differential-to-Single-Ended Converter Based on Enhanced Body-Driven Current Mirrors Targeting Ultra-Low-Voltage OTAs

A Differential-to-Single-Ended Converter Based on Enhanced Body-Driven Current Mirrors Targeting Ultra-Low-Voltage OTAs

A Standard-Cell-Based CMFB for Fully Synthesizable OTAs

A body‐driven rail‐to‐rail 0.3 V operational transconductance amplifier exploiting current gain stages

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