Precizni dvostrani usmerivači malih signala realizovani u tehnici strujnog procesiranja
Докторанд
Vesković, MilanМентор
Đukić, SlobodanЧланови комисије
Petković, PredragMančić, Dragan
Đukić, Slobodan
Метаподаци
Приказ свих података о дисертацијиСажетак
REZIME:
Obrada analognih signala može se izvoditi u tehnici naponskog ili strujnog
procesiranja. Iako je naponsko procesiranje imalo dominantniju ulogu u obradi
signala dugi niz godina, pojavom strujnih prenosnika, strujno procesiranje dobija na
značaju u poslednjih dvadesetak godina zbog više svojih prednosti koje su dokazane na
primerima preciznih dvostranih usmerača za male signale obrađenih i u ovoj tezi. Pre
svega prednost se ogleda u povećanju širine propusnog opsega zbog upotrebe
opterećenja male impedanse.
Predmet disertacije je realizacija preciznih dvostranih usmerača za signale
malih amplituda u tehnici strujnog procesiranja. Precizno usmeravanje je važna
funkcija obrade signala koja ima izuzetnu važnost kod mnogih mernih uređaja kao što
su voltmetri i ampermetri za naizmenične signale, detektori polariteta signala,
detektori vršne vrednosti, detektori amplitudno-modulisanih signala, kola za
usrednjavanje signala itd..
Nakon opisa tehnike strujnog procesiranja ...i prikaza translinearnog principa,
kao polazne osnove za realizaciju brojnih nelinearnih kola u bipolarnoj tehnologiji,
razmatran je koncept strujnog prenosnika sa posebnim osvrtom na strujnom prenosniku
druge vrste sa bipolarnim tranzistorima. Opisan je i koncept operacionog
prenosnika, a sa posebnom pažnjom obrađen je operacioni prenosnik druge vrste sa
strujnim kormilarenjem. Dat je i prikaz uporedne analize preciznih dvostranih
usmerača realizovanih u tehnici naponskog procesiranja kao i u tehnici strujnog
procesiranja, sa prednostima i manama jednih u odnosu na druge.
U disertaciji su predstavljena dva modela preciznog dvostranog usmerača za
male signale, od kojih prvi model koristi operacioni prenosnik, četiri strujna
ogledala i dva strujna izvora, dok je drugi model realizovan sa dva operaciona
prenosnika i dve diode sa predpolarizacijom. Osobine realizovanih usmerača su
znatno bolje u odnosu na usmerače realizovane sa istim elektronskim komponentam u
tehnici naponskog procesiranja. Kroz simulacionu i eksperimentalnu proveru
dokazano je da je moguće realizovati precizni dvostrani usmerač u tehnici strujnog
procesiranja koji radi u širokom frekventnom opsegu, za signale male amplitude,
upotrebom dve diode umesto četiri, kako je to do sada uglavnom rađeno. Takođe je
pokazano da ovakav usmerač ima sve bitne osobine bolje od osobina usmerača
realizovanog u tehnici naponskog procesiranja.
SUMMARY:
The processing of analog signals can be performed in the voltage or current processing
technique. Although the voltage processing has had a more dominant role in signal processing
for many years, with the adventages of current conveyors, current processing has become more
important over the past twenty years due to its manifold advantages, which have been proved
by examples of precision full wave rectifiers for small signals dealt with in this thesis. The first
advantage is the in increase of the bandwidth due to the use of a small impedance load.
The subject of the doctoral thesis is the realization of full-wave rectifier for small
amplitude signals in a current mode processing techniques. Precise rectification is an important
function of signal processing and it is highly significant in many measuring devices, such as
voltmeters, ammeters for alternating signals, detectors, signal polarity detectors, peak
detectors, amplitude-modulated signal detectors, averaging ...circuits, etc...
The dissertation presents the description of a current processing technique and
translinear principle as an initial point for the realization of numerous nonlinear circuits in
bipolar technology. This is followed by a speculation on a concept of current conveyor, where
a special focus is placed on a different type of current conveyor with bipolar transistors. In
addition, the concept of operational conveyor is given with an emphasis on a different type of
operational conveyor with current steering output stage. The thesis also presents a comparative
analysis of full-wave rectifiers, which are realized in both, voltage and current processing
techniques, as well as their advantages and disadvantages compared to each other.
The dissertation presents two models of precision full-wave rectifier for low-level
signals, as well as the realization of the rectifiers out of which one uses an operational conveyor
and four current mirrors and two direct current sources, while another one has two operational
conveyors and two diodes with polarization before of them. The characteristics of such
rectifiers are significantly better compared to the rectifiers with the same electronic
components in voltage processing technique. Through simulation and experimental verification
it has been proved that the full-wave rectifier in a current processing technique can be realized
for wide frequency range, for low amplitude signals, by using two diodes instead of four, as it
has been mostly done so far. It was also shown that such rectifiers have better characteristics
than the rectifiers realized in voltage processing mode.