A novel OTA compensation approach suitable for CT‐ΔΣ modulators

Hasanzadeh, Mohammad; Abrishamifar, Adib

doi:10.1002/cta.2516

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…In the continuation of this study, the proposed AVC and AVG functions will be applied to the interfacing numerical circuits as microcontroller unit board. This technological solution can be a good candidate for the future technology as the amplitude matching low voltage digital circuits [39,40].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Experimentation of Voltage Compressor and Decompressor With Active Circuit

Ji¹,

Wu²,

Wang³

et al. 2019

PIER C

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This paper introduces an innovative circuit theory of analog voltage compressor (AVC) and decompressor (AVD). This electronic function can also be assumed as an analog voltage converter. Analytically, it acts as power function synthesizer topology designed with an analog nonlinear circuit. The AVC/AVD topologies are based on an operational amplifier associated with resistor and non-linear diode components. Given the positive parameter a > 0, the main x-y characteristic of the AVC/AVD is formulated by y = x a for the input and output x and y, respectively. The synthesis formulas allowing to determine the AVC/AVD parameters as a function of a are established. To validate the original AVC/AVD concept, static and dynamic simulations and experimentations with a proof-of-concept circuit using operational amplifier UA741 are carried out. As expected, well correlated x 1/2-AVC and x 2-AVD characteristics are realized with the static testing for the voltage range varied from 0 to 9-V and 0 to 3-V for AVC and AVD circuits, respectively. The simulation and experimentation of dynamic test results are in good agreement for the sine wave voltages with frequency varied from DC to 1-kHz. The simulated and experimental results confirm the relevance of the developed compressor/decompressor analog circuit. The AVC/AVD functions for instrumentation system applications can be potentially applied to the amplitude matching especially for digital systems.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Experimentation of Voltage Compressor and Decompressor With Active Circuit

Ji¹,

Wu²,

Wang³

et al. 2019

PIER C

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7][8][9] Numerous circuits like current conveyors, 10 voltage-controlled oscillators, 11 linear regulators, 12,13 switchedcapacitor circuit, 14 low-dropout regulator 15 and liquid crystal display drivers, [16][17][18] micro-electromechanical system sensors, 19 multipliers 20 use OTA for implementing their functionality. Indeed, important circuits like programmable gain amplifiers, 21,22 variable gain amplifiers, 21 filters, [23][24][25] modulators, 26,27 and transimpedance amplifiers 28,29 use OTAs to form systems on chip. In such systems, OTA is expected to improve current utilization and reduce power consumption, noise and voltage requirements.…”

Section: Introductionmentioning

confidence: 99%

Design of low‐voltage low‐noise operational transconductance amplifiers for low frequency applications

Sharma,

Kumar,

Madan

et al. 2024

Int J Numerical Modelling

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Low‐noise and low‐voltage operation is prime requirement of an operational transconductance amplifier for low frequency applications. However, achieving low‐noise operation at low supply voltages is a challenging task in CMOS technology owing to noise‐power and noise‐stability tradeoffs. This article outlines, the design of four differential bias self‐cascode (DBSC) operational transconductance amplifiers (OTAs) working at ±0.7 V. The four design techniques namely gate driven (GD), bulk driven (BD), bulk driven quasi‐floating gate (BDQFG), and gate driven quasi floating bulk (GDQFB) have been applied on DBSC OTAs. The designing aspects and performance parameters of these four OTAs such as gain, gain‐bandwidth, input referred noise (IRN), settling time (ST), common mode rejection ratio (CMRR), total harmonic distortion, input impedance, transconductance, power consumption, area consumption and process/mismatch variations have been fairly compared in this work. These DBSC OTAs have been designed and simulated using a standard 0.18‐μm 6M1P CMOS N‐well process. The results infer GD DBSC OTA shows high CMRR of 125.83 dB. While the BD DBSC OTA consumes very low power of 0.2 μW. The BDQFG DBSC OTA shows low 1% ST of 24.83 μS. The GDQFB DBSC OTA show high transconductance (2.35 mS), high gain (64.97 dB), and low IRN (0.40 μV/√Hz at 10 Hz). The theoretical predictions for these OTAs agree with the post‐layout simulations. The proposed OTAs can be used for designing various analog circuits such as programmable gain amplifiers, variable gain amplifiers, and transimpedance amplifiers for low‐frequency biomedical and health care applications.

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A novel OTA compensation approach suitable for CT‐ΔΣ modulators

Cited by 2 publications

References 13 publications

Synthesis and Experimentation of Voltage Compressor and Decompressor With Active Circuit

Synthesis and Experimentation of Voltage Compressor and Decompressor With Active Circuit

Design of low‐voltage low‐noise operational transconductance amplifiers for low frequency applications

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