22.3 A 0.5V 9.26μW 15.28mΩ/√Hz Bio-Impedance Sensor IC With 0.55° Overall Phase Error

Kim, Kwantae; Kim, Jihoon; Gweon, Surin; Lee, Jiwon; Kim, Minseo; Lee, Byoung Hun; Kim, Soyeon; Yoo, Hoi‐Jun

doi:10.1109/isscc.2019.8662466

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…The SFDR is mainly bounded by the swing range of LPF (10mV pp output) that is operating from the 0.5V of low-supply. Note that the residual highpass-shaped 3rd order quantization noise is not completely removed due to the order of 2 of LPF, however, it is out of bandwidth of the readout which is 400kHz for example in [4]. Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…In this work, we propose a 6.2µW, 0.059mm 2 , 0.088% THD sinusoidal CG with 20kHz and 2µApp injection current. The key specification of low-distortion outperforms the recently published sub-10µW Bio-Z sensor IC [4] by 7.5×, also exhibiting 8.9× less power consumption compared to the This paper was accepted for publication and was presented in 2020 IEEE Symposium on VLSI Circuits (DOI: 10.1109/VLSICir-cuits18222.2020.9162983). This preprint is intended to offer fully formatted list of citations, which was not feasible within the constraints of the original conference manuscript due to page limit.…”

Section: Introductionmentioning

confidence: 99%

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A 0.5V, 6.2μW, 0.059mm² Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

Kim

Choi

et al. 2020

2020 IEEE Symposium on VLSI Circuits

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This paper presents the first sub-10µW, sub-0.1% total harmonic distortion (THD) sinusoidal current generator (CG) integrated circuit (IC) that is capable of 20kHz output for the bio-impedance (Bio-Z) sensing applications. To benefit from the ultra-low-power nature of near-threshold operation, a 9b pseudo-sine lookup table (LUT) is 3b ∆Σ modulated in the digital domain, thus linearity burden of the digital-toanalog converter (DAC) is avoided and only a 1.29µW of logic power is consumed, from a 0.5V supply and a 2.56MHz clock frequency. A half-period (HP) reset is introduced in the capacitive DAC, leading to around 30dB reduction of in-band noise by avoiding the sampling of data-dependent glitches and attenuating the kT /C noise and the non-idealities of reset switches (SW).

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Section: Measurement Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 0.5V, 6.2μW, 0.059mm² Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

Kim

Choi

et al. 2020

2020 IEEE Symposium on VLSI Circuits

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“…This is because the center frequency of the BPF is controlled by the frequency of an external clock, rather than g m of the transconductors, therefore ω 0 can be precisely controlled over process, voltage, and temperature (PVT) variations. A chopper-based mixer with a sequentially varying clock frequency and a subsequent LPF stage was used in [59] where its operational principle is similar to that of lock-in amplifiers, also commonly used in bio-impedance sensors [52], [70]. This architecture achieved a 60 nW ultra-low-power consumption, however, because it sequentially demodulates over the desired frequency band, it cannot perform the filtering operation over its entire frequency range at once.…”

Section: Discussionmentioning

confidence: 99%

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

Kim¹,

Liu²

2022

Preprint

Self Cite

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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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“…Factor m has a typical value of 2.2 for silicon [25], and the parameters C 1 , C 2 , C 3 , C 4 , C 5 are constants with positive value. From (11), it can be deduced that I B (T) exhibits a CTAT characteristic over the temperature range of T < C 4 /C 5 , and the estimation of I B (T) will be discussed in the subsequent Section. Of particular note, the value of C 4 /C 5 is above 2T 0 (600 K) which is beyond the operation temperature range of the transistor.…”

Section: Low-pass Filter In Psr Enhancermentioning

confidence: 99%

“…Therefore, low-power low-voltage performance becomes one of main agendas in sensor circuit design. The exemplary circuits are low-voltage, low dropout wireless sensor node [ 10 ] and low-power low-voltage biomedical sensor IC [ 11 ]. Based on the above discussed sensor applications, the Low Dropout (LDO) Regulator is regarded as the common building block used to produce a stable supply voltage to sustain the sensor circuit performance whilst providing adequate PSR as another important characteristic in sensor circuits and systems.…”

Section: Introductionmentioning

confidence: 99%

A CMOS PSR Enhancer with 87.3 mV PVT-Insensitive Dropout Voltage for Sensor Circuits

Zhang

Chan

2021

Sensors

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A new power supply rejection (PSR) based enhancer with small and stable dropout voltage is presented in this work. It is implemented using TSMC-40 nm process technology and powered by 1.2 V supply voltage. A number of circuit techniques are proposed in this work. These include the temperature compensation for Level-Shifted Flipped Voltage Follower (LSFVF) and the Complementary-To-Absolute Temperature (CTAT) current reference. The typical output voltage and dropout voltage of the enhancer is 1.1127 V and 87.3 mV, respectively. The Monte-Carlo simulation of this output voltage yields a mean T.C. of 29.4 ppm/°C from −20 °C and 80 °C. Besides, the dropout voltage has been verified with good immunity against Process, Temperature and Process (PVT) variation through the worst-case simulation. Consuming only 4.75 μA, the circuit can drive load up to 500 μA to yield additional PSR improvement of 36 dB and 20 dB of PSR at 1 Hz and 1 MHz, respectively for the sensor circuit of interest. This is demonstrated through the application of an enhancer on the instrumentation Differential Difference Amplifier (DDA) for sensing floating bridge sensor signal. The comparative Monte-Carlo simulation results on a respective DDA circuit have revealed that the process sensitivity of output voltage of this work has achieved 14 times reduction in transient metrics with respect to that of the conventional counterpart over the operation temperature range in typical operation condition. Due to simplicity without voltage reference and operational amplifier(s), low power and small consumption of supply voltage headroom, the proposed work is very useful for supply noise sensitive analog or sensor circuit applications.

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22.3 A 0.5V 9.26μW 15.28mΩ/√Hz Bio-Impedance Sensor IC With 0.55° Overall Phase Error

Cited by 7 publications

References 6 publications

A 0.5V, 6.2μW, 0.059mm² Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

A 0.5V, 6.2μW, 0.059mm² Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

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

A CMOS PSR Enhancer with 87.3 mV PVT-Insensitive Dropout Voltage for Sensor Circuits

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22.3 A 0.5V 9.26μW 15.28mΩ/√Hz Bio-Impedance Sensor IC With 0.55° Overall Phase Error

Cited by 7 publications

References 6 publications

A 0.5V, 6.2μW, 0.059mm2 Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

A 0.5V, 6.2μW, 0.059mm2 Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

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

A CMOS PSR Enhancer with 87.3 mV PVT-Insensitive Dropout Voltage for Sensor Circuits

Contact Info

Product

Resources

About

A 0.5V, 6.2μW, 0.059mm² Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing

A 0.5V, 6.2μW, 0.059mm² Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing