Eng. Alexandru LAVRIC, PhD S, Prof. Eng. Valentin POPA PhD, Eng. Codrin MALES PhD S, Eng. Ilie FINIS PhD S
Rezumat
Datorita perturbatiilor introduse de fading este nevoie de o continua imbunatatire a circuitelor de reglaj
automat al amplificarii AGC (Autimatic Gain Controller). Circuitele AGC au ca functie principala obtinerea unui nivel de semnal constant la iesire indiferent de variatia semnalului de intrare. Aceasta variatie a semnalului poate duce la pierderea informatiei sau la scaderea critica a performantei. In aceasta lucrare este prezentata analiza, proiectarea si evaluarea
performantelor unui circuit AGC cu bucla de reactie.
Cuvinte cheie: circuit de reglaj automat al amplificariicircuitAGCfading.
Abstract
Due to the disturbances caused by the fading phenomenon (defined as the amplitude variation of received
signal), there is a continuous need to improve the automatic gain control circuits (AGC). The main function of AGC circuits is to obtain a constant output signal level regardless of input signal variation. This variation can determine loss of information or critical decrease in the level of performance. This paper presents the design and performance evaluation of
a feedback loop AGC circuit.
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