93.8% Current Efficiency and 0.672 ns Transient Response Reconfigurable LDO for Wireless Sensor Network Systems

Gweon, Surin; Lee, Jae-Hyuk; Kim, Kwantae; Yoo, Hoi‐Jun

doi:10.1109/iscas.2019.8702435

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…16 shows a schematic, g m C equivalent, and block diagram of the flipped voltage follower (FVF)-based filter circuits [46]. The FVF circuit has been actively used as a core building block in various analog circuits to name, such as LPF [45], low-dropout (LDO) regulator [47]- [49], bio-signal amplifier [50]- [55], and current driver [56], [57]. As of the case in the SSF filters, the FVF filters are also categorized into two types according to the connection methods of C 1 capacitor.…”

Section: Source-follower-based Filtersmentioning

confidence: 99%

Continuous-Time Analog Filters for Audio Edge Intelligence: Review and Analysis on Design Techniques

Kim¹,

Liu²

2022

Preprint

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Silicon cochlea designs capture the functionality of the biological cochlea. Their use has been explored for cochlea prosthesis applications and more recently in edge audio devices which are required to support always-on operation. As their stringent power constraints pose several design challenges, IC designers are forced to look for solutions that use low standby power. One promising bio-inspired approach is to combine the continuous-time analog filter channels of the silicon cochlea with a small memory footprint deep neural network that is trained on edge tasks such as keyword spotting, thereby allowing all blocks to be embedded in an IC. This paper reviews the analog filter circuits used as feature extractors for current edge audio devices, starting with the original biquad filter circuits proposed for the silicon cochlea. Our analysis starts from the interpretation of a basic biquad filter as a two-integrator-loop topology and reviews the progression in the design of second-order low-pass and band-pass filters ranging from OTA-based to source-followerbased architectures. We also derive and analyze the small-signal transfer function and discuss performance aspects of these filters. The analysis of these different filter configurations can be applied to other application domains such as biomedical devices which employ a front-end bandpass filter.

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Section: Source-follower-based Filtersmentioning

confidence: 99%

Continuous-Time Analog Filters for Audio Edge Intelligence: Review and Analysis on Design Techniques

Kim¹,

Liu²

2022

Preprint

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“…However, fluctuations in power consumption cause the current to fluctuate, making it crucial to provide stable power under wide-ranging load changes for power management chips. Digital low-dropout regulators (LDOs) [1][2][3][4] offer advantages over analog LDOs, [5][6][7][8][9][10] such as lower static power consumption, smaller size, and better transient response, despite potential output ripple and poor noise immunity. However, when facing larger load variations, digital LDOs can easily generate spike voltages and even experience significant momentary voltage dropouts during the transition from light to heavy loads, resulting in adverse effects on load circuits.…”

Section: Introductionmentioning

confidence: 99%

A high-efficiency and wide-load current range LDO with dynamic loop gain control technique

Lo,

Chiu,

Lin

et al. 2024

Jpn. J. Appl. Phys.

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The design proposes a low-dropout regulator (LDO) incorporating dynamic loop gain control to accommodate a wide load current range. It introduces a multi-phase error detection mechanism, a tri-state damping selector, and a dynamic integration shift register. These elements predict load variations and dynamically increase loop gain when the load variation is significant, all without increasing the input clock. This approach achieves a fast response and low power consumption simultaneously. The chip was implemented in 0.18-µm CMOS, with an input operating voltage of 1.2 V and an output voltage of 1 V. The measured results revealed that it could provide output currents from 0.5 mA to 150 mA, indicating that it had a 300 times wider current range. The maximum current efficiency was 99.93%, and the core area was 0.198 mm2.

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“…LDOs play a crucial role in a wide range of applications, such as driving noise-sensitive analog, RF, mixed-signal, and digital module interfaces. [9][10][11][12][13][14] In many cases, power supply circuits use LDOs and switch-mode power supplies (SMPSs) connected in series to optimize their efficiency and achieve a low noise output voltage. Therefore, the power supply rejection ratio (PSRR) characteristic of the LDO is crucial to suppress the output voltage ripple of the SMPS.…”

Section: Introductionmentioning

confidence: 99%

Low quiescent current LDO with FVF-based PSRR enhanced circuit for EEG recording wearable devices

Mii,

Kanemoto,

Hirose

2024

Jpn. J. Appl. Phys.

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This paper presents a low quiescent current low-dropout regulator (LDO) with an auxiliary amplifier, flipped voltage follower (FVF)-based power supply rejection ratio enhanced circuit (FBPEC) for electroencephalogram (EEG) recording devices. The FBPEC comprises a FVF filter, current mirror, and common-source amplifier. The FBPEC exploits the characteristics of FVF filter to reduce the current consumption and increase the gain at specific frequencies. The small-signal equivalent circuit reveals the dominant pole of the FBPEC, which is affected by the output impedance and load capacitance of the common-source amplifier. The proposed LDO is designed using a 0.18 μm CMOS process and has improved power supply rejection ratio (PSRR) up to 18 dB at frequencies above 10 kHz compared to the general LDO. The proposed LDO has a low no-load quiescent current 648 nA and a good figure-of-merit score compared to those of previous works, proving that the proposed circuit is an effective solution for use in wearable EEG recording devices.

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93.8% Current Efficiency and 0.672 ns Transient Response Reconfigurable LDO for Wireless Sensor Network Systems

Cited by 13 publications

References 16 publications

Continuous-Time Analog Filters for Audio Edge Intelligence: Review and Analysis on Design Techniques

Continuous-Time Analog Filters for Audio Edge Intelligence: Review and Analysis on Design Techniques

A high-efficiency and wide-load current range LDO with dynamic loop gain control technique

Low quiescent current LDO with FVF-based PSRR enhanced circuit for EEG recording wearable devices

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