Sine Wave Oscillation Circuit with Stable Amplitude Composed of FET

Published:2011/9/8 1:47:00 Author:Sue | Keyword: Sine Wave, Oscillation, Stable Amplitude | From:SeekIC

      The picture shows the sine wave oscillation circuit with stable amplitude composed of FET. In the circuit, VD2 and C1 can rectify and filtrate the output sine wave and then make it direct current voltage. The voltage controls FET(VT1)'s grid electrode. FET works as variable resistor. If the output voltage becomes higher, then FET's grid electrode level becomes higher and the resistance value between the drain electrode and source eletrode becomes lower. Then the positive feedback factor which returns to A1's same-phase input terminal becomes smaller and output amplitude becomes smaller and returns to its old value which will make its amplitude stay unchanged.



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