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Laborator 2
Etaje de conditionare a traductoarelor parametrice
Etajele de conditionare a traductoarelor parametrice, care se bazeaza pe modificarea frecventei semnalului sunt de fapt oscilatoare.
Oscilatoarele sunt circuite electronice neliniare care produc semnale periodice cu o anumita amplitudine si frecventa de oscilatie. Oscilatoarele se clasifica dupa forma semnalului electric furnizat in oscilatoare armonice sau sinusiodale si nearmonice.
Oscilatoarele armonice
Oscilatoarele sinusoidale se impasrt in doua categorii:
a) Oscilatoare RC la care sarcina si reteaua de reactie sunt constituite din rezistori si condensatoare conectate corespunzator.
b) Oscilatoare LC la care sarcina si reteaua de reactie sunt constituite din bobine si condensatoare conectate corespunzator.
Fig.1 Reteaua Wien
Factorul de transfer, dat de cele doua elemente este dat de relatia:
Se considera un oscilator Wien cu amplificator operational(fig.2). Se impune R si , obtinem
Unul din elementele circuitului poate fi senzor rezistiv sau capacitiv, iar variatia reactantei sale va produce o modificare a frectventei oscilatorului.
Oscilatoare LC
Exista o mare varietate de oscilatoare LC atat din punct de vedere al schemei de principiu cat si al dispozitivului electronic utilizat. Vom analiza cateva din schemele posibile:
a) Oscilator Colpittus are schema prezentata in fig.2
Fig.2 Oscilator Colpittus
Oscilatoare nearmonice
Oscilatoarele nearmonice sunt cele care furnizeaza la iesire semnale care nu sunt sinusoidale
Circuitul basculant cu amplificator operational este un circuit care genereaza impulsuri dreptunghiulare, schema electrica a circuitului si formele de unda fiind prezentate in fig.3.
La iesirea circuitului tensiunea U este fie maxima, fie minima.
Presupunem ca , ccondensatorul C se incarca atata timp cat
Valoarea limita la care se incarca condensatorul notata cu U se deduce din realtia:
Fig.3 Oscilatoare nearmonice
a) schema electrica ; b) forme de unda.
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