A CMOS sinusoidal signal generator based on mixed-time processing for electrical bioimpedance spectroscopy supporting beta dispersion range

Kweon, Soon-Jae; Jo, Sung-Hun; Park, Jeong-Ho; Yoo, Hyung-Joun

doi:10.1109/apccas.2016.7803904

Cited by 9 publications

(13 citation statements)

References 11 publications

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“…The thirdorder harmonic tone is -9 dBc, which is considered very large for most cases. Odd-order harmonics of the DAC-based sinusoid are smaller than those of the square waveform [44], [45], but they need to be attenuated further for high linearity in many cases. SSGs have adopted two types of filters: CT and DT filters.…”

Section: B Linearity Enhancementmentioning

confidence: 99%

Section: A Dac-based Sinusoidmentioning

confidence: 99%

“…Besides, in order to reduce both unit components and switching logics, DAC-based sinusoids with a small N DAC and a small OSR have been employed in spite of their large harmonics [38], [44], [45], [50], [65]- [67]. For instance, N DAC = 3 [44], [45] and 20 unit cells [65] are adopted with OSR = 16. Although the complexity and area can be reduced thanks to the reduced N DAC and OSR, these waveforms need sufficiently steep filtering to attenuate not only the sampling harmonics but also the low-order harmonics.…”

Section: A Dac-based Sinusoidmentioning

confidence: 99%

“…CT filters have been widely adopted in on-chip SSGs [35], [36], [38], [39], [44], [45], [47], [51], [52], [59], [62], [63], [73], [101], [102]. The most simple but fundamental CT filter is passive RC LPFs.…”

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

“…Alternatively, active g m -C filters have been adopted for decreasing the minimum f SG with small die area [38], [39], [44], [51], [52], [59], [73], [101], [102]. Fig.…”

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

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On-Chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review

Kweon¹,

Rafi

Cheon

et al. 2022

IEEE Trans. Biomed. Circuits Syst.

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This paper reviews architectures and circuit implementations of on-chip sinusoidal signal generators (SSGs) for electrical impedance spectroscopy (EIS) applications. In recent years, there have been increasing interests in on-chip EIS systems, which measure a target material's impedance spectrum over a frequency range. The on-chip implementation allows EIS systems to have low power and small form factor, enabling various biomedical applications. One of the key building blocks of on-chip EIS systems is on-chip SSG, which determines the frequency range and the analysis precision of the whole EIS system. On-chip SSGs are generally required to have high linearity, wide frequency range, and high power and area efficiency. They are typically composed of three stages in general: waveform generation, linearity enhancement, and current injection. First, a sinusoidal waveform should be generated in SSGs. The generated waveform's frequency should be accurately adjustable over a wide range. The firstly generated waveform may not be perfectly linear, including unwanted harmonics. In the following linearity-enhancement step, these harmonics are attenuated by using filters typically. As the linearity of the waveform is improved, the precision of the EIS system gets ensured. Lastly, the filtered voltage waveform is now converted to a current by a current driver. Then, the current sinusoidal signal is injected into the target impedance. This review discusses the principles, advantages, and disadvantages of various techniques applied to each step in state-of-the-art on-chip SSGs. In addition, state-of-the-art designs are compared and summarized.

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Section: B Linearity Enhancementmentioning

confidence: 99%

Section: A Dac-based Sinusoidmentioning

confidence: 99%

Section: A Dac-based Sinusoidmentioning

confidence: 99%

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

“…Alternatively, active g m -C filters have been adopted for decreasing the minimum f SG with small die area [38], [39], [44], [51], [52], [59], [73], [101], [102]. Fig.…”

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

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