Special analog multipliers in voltage-controlled oscillator and phase-locked loop-based FM demodulator for measurement and processing of sensed low-frequency signals

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F22%3APU145476" target="_blank" >RIV/00216305:26220/22:PU145476 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0263224122009393" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0263224122009393</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.measurement.2022.111734" target="_blank" >10.1016/j.measurement.2022.111734</a>

Result language

angličtina

Original language name

Special analog multipliers in voltage-controlled oscillator and phase-locked loop-based FM demodulator for measurement and processing of sensed low-frequency signals

Original language description

The processing of low-frequency slowly varying signals (e.g. nonelectrical signals measured by sensors) in on-chip signal processing systems is not an easy task due to using of AC coupling between the parts of integrated components (e.g. very large and on-chip nonproductive values of coupling capacity required for separation of the DC component of a signal). One of the solutions to overcome this issue immediately at the input site is to transpose such low-frequency signals to higher frequency bands, for instance, based on the principle of frequency modulation/demodulation (FM) spectral transposition (higher frequency of the processed signal means lower value of coupling capacity). This paper focuses on the improvement of a voltage-controlled oscillator (VCO) for phase-locked loop (PLL) based FM demodulator for processing and measurement of signals with slow changes. There is introduced a novel concept of adjustability of the oscillation condition performed by a special analog multiplier. It brings reduction of complexity of the resulting topology and the designed oscillator operates with linearly adjustable (by DC voltage) frequency range of one decade from 4 kHz up to 43 kHz. This VCO is applied in a demodulator of FM modulated waveforms based on PLL methodology employing the same active cells (integrated multipliers and buffers). The proposed and realized concept is suitable for specific low-frequency applications and the presented example improves propagation of low-frequency signals of mechanical vibrations and biomedical signals through signal-processing systems integrated on chip (e.g. a sensed electrocardiogram wave) where fabrication of large coupling capacity values on chip represents significant issue. Active cells fabricated in ON Semiconductor 0.35 mu m I3T25 3.3 V process were used for experimental verification.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/GA19-22248S" target="_blank" >GA19-22248S: Deterministic, chaotic and stochastic phenomena in the sub-micron integrated structures</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

MEASUREMENT, Journal of the International Measurement Confederation (IMEKO)

ISSN

0263-2241

e-ISSN

1873-412X

Volume of the periodical

201

Issue of the periodical within the volume

9

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

1-17

UT code for WoS article

000848146100003

EID of the result in the Scopus database

2-s2.0-85136471690