The voltage-controlled oscillator circuit with high output amplitude stability

Published:2011/9/12 21:52:00 Author:TaoXi | Keyword: Voltage-controlled, oscillator, high, output amplitude, stability | From:SeekIC

The voltage-controlled oscillator circuit with high output amplitude stability is as shown in the figure. In this circuit, the VT2 controls the collector electrode current of VT1, so the oscillation amplitude of VT1 is very stable. The output signal of VT4 is detected by VD2 to change into the DC signal, it is the automatic gain control working state, so you can make the DC voltage keep constant. The midpoint voltage of RP1 is -0.6V, the current of R1 and R2 can keep the equal, so we can make the output amplitude keep in a constant value. The oscillation frequency is decided by the L1, C2, the capacitance of VD1 and the distributed capacitance.



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