A K-Band Complex Permittivity Sensor for Biomedical Applications in 130-nm SiGe BiCMOS

Lammert, Vincent; Heine, Carl; Wessel, Jan; Jamal, Farabi Ibne; Kissinger, Dietmar; Geiselbrechtinger, Angelika; Issakov, Vadim

doi:10.1109/tcsii.2019.2921199

Cited by 18 publications

(10 citation statements)

References 11 publications

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“…, which agrees with the tangent at  mut = 1 of the numerical curve obtained through (10), shown in Fig. 4(a).…”

Section: B Sensitivity Of the Resonance Frequency To  Mutsupporting

confidence: 89%

“…3. The results obtained with the complete analytical expression (9) and with the numerical zerovalue contour (10) are overlapped in all cases. In agreement with the previous derivations, the sensitivity increases when reducing F 1 .…”

Section: A Input Admittancementioning

confidence: 97%

“…Some examples are the works [1]- [2], which make use of step-impedance resonators and [3]- [4], which make use of split ring resonators [3]- [4]. On the other hand, the recent works [5]- [9] are based on the detection of phase variations [10]- [12] when exciting the system at a constant frequency. In those sensors, which operate in either transmission or reflection mode, the phase varies in the presence of the MUT.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the work [13] presents a detailed analysis of oscillators containing a slowwave structure [14]- [18], which enables a low phase-noise spectral density. In fact, oscillator-based sensors [19]- [29] have the advantage of a self-sustained operation, in which the MUT variations give rise to a change in the oscillation amplitude and frequency [21]- [22], easily measured with the aid of amplitude or frequency detection interfaces; for instance, frequency variations can be detected from the control voltage of a synthesizer and amplitude variations by means of a power detector or through the control voltage of a feedback loop [10], [21], [25]- [28].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Oscillators Based on Step-Impedance and Slow Wave Transmission Lines for Sensing Applications

Pontón

Sancho

Herrera

et al. 2023

IEEE Trans. Microwave Theory Techn.

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This work investigates the capabilities of oscillators based on step-impedance and slow-wave structures to sense dielectric constants. The material under test (MUT) is placed over the structure and the objective is to achieve a high sensitivity of the oscillation frequency with the advantage of a low phase noise, enabled by the high-quality factor of the structure. With the aid of simplified analytical models, we will initially study the variation of the resonance frequency of a step-impedance transmission line with the dielectric constant of the MUT, paying attention to the influence of the number of line sections. The study includes the derivation of analytical expressions for the sensitivity of the resonance frequency. Next the structure will be connected to the oscillator active core, which will be modeled with a numerical nonlinear admittance function extracted from harmonic-balance (HB) simulations. The resulting semi-analytical formulation will provide insight into the variation of the oscillation frequency and amplitude with the dielectric constant of the MUT, as well as the variation of the phase-noise spectral density. It will also enable a versatile test and optimization of the various structures to achieve a high sensitivity with a low phase noise. The methods have been successfully applied to a FET-based oscillator at about 2 GHz.

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“…, which agrees with the tangent at  mut = 1 of the numerical curve obtained through (10), shown in Fig. 4(a).…”

Section: B Sensitivity Of the Resonance Frequency To  Mutsupporting

confidence: 89%

Section: A Input Admittancementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oscillators Based on Step-Impedance and Slow Wave Transmission Lines for Sensing Applications

Pontón

Sancho

Herrera

et al. 2023

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Fig. 20(a) shows the results for healthy tissue that yields an output voltage of 0.5 V, while the calcified The encouraging results from the abovementioned experiments have led to an implementation of a high-frequency K-band permittivity sensor in a commercial 130-nm BiCMOS technology [140] for wider application in the detection of biomaterials. Fig.…”

Section: Invasive and Implanted Sensorsmentioning

confidence: 92%