Methods for Extended Tunability in Quadrature Oscillators Based on Enhanced Electronic Control of Time Constants

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F18%3APU127052" target="_blank" >RIV/00216305:26220/18:PU127052 - isvavai.cz</a>

Výsledek na webu

<a href="http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8292930" target="_blank" >http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8292930</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/TIM.2018.2799058" target="_blank" >10.1109/TIM.2018.2799058</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Methods for Extended Tunability in Quadrature Oscillators Based on Enhanced Electronic Control of Time Constants

Popis výsledku v původním jazyce

New methods for extending the tunability range in second-order voltage controlled oscillators (VCOs) with quadrature outputs are presented and compared in this paper. Linear dependence is the most common type of relation between frequency of oscillations (FO) and control voltage (or current) in communication subsystems (VCOs). However, there are other non-linear types of dependencies that are advantageous (quadratic, cubic, ...) and should be further studied. Positions of controllable blocks within the structure of the oscillator (providing parameters influencing time constants of integrators) in two scenarios are studied together. The impact of controllable parameters of these additional elements on FO as well as on produced output signal levels is evaluated. Simulation and experimental results are shown to confirm expected behavior of solutions in the case of the quadratic type of control of FO. Nowadays, standard linear control offers a tunability ratio 10:1 (for the same ratio of parameters that control the FO) only. However, in this paper the experimental tests yield a tunability ratio 80:1 (50 kHz – 4 MHz) for DC control voltage within the range 0.175 V to 1.75 V (10:1). The presented approach is very beneficial for low supply voltage systems requiring a wide range of tunability and also for utilizing active devices having limited range of adjustability of their controllable parameters while still requiring wide tunability.

Název v anglickém jazyce

Methods for Extended Tunability in Quadrature Oscillators Based on Enhanced Electronic Control of Time Constants

Popis výsledku anglicky

New methods for extending the tunability range in second-order voltage controlled oscillators (VCOs) with quadrature outputs are presented and compared in this paper. Linear dependence is the most common type of relation between frequency of oscillations (FO) and control voltage (or current) in communication subsystems (VCOs). However, there are other non-linear types of dependencies that are advantageous (quadratic, cubic, ...) and should be further studied. Positions of controllable blocks within the structure of the oscillator (providing parameters influencing time constants of integrators) in two scenarios are studied together. The impact of controllable parameters of these additional elements on FO as well as on produced output signal levels is evaluated. Simulation and experimental results are shown to confirm expected behavior of solutions in the case of the quadratic type of control of FO. Nowadays, standard linear control offers a tunability ratio 10:1 (for the same ratio of parameters that control the FO) only. However, in this paper the experimental tests yield a tunability ratio 80:1 (50 kHz – 4 MHz) for DC control voltage within the range 0.175 V to 1.75 V (10:1). The presented approach is very beneficial for low supply voltage systems requiring a wide range of tunability and also for utilizing active devices having limited range of adjustability of their controllable parameters while still requiring wide tunability.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

ISSN

0018-9456

e-ISSN

1557-9662

Svazek periodika

67

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

1495-1505

Kód UT WoS článku

000431903000024

EID výsledku v databázi Scopus

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