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【多选题】
如图 所示是 RC 正弦波振荡电路,下列说法正确的是 ( )
A.
电路在起振阶段,要求:
B.
振荡稳定后,要求电路的放大倍数等于3
C.
设电路中两个电容都为C,则振荡角频率为:ω=1/RC;
D.
设电路中两个电容都为C,则振荡频率为:f=1/(2πRC);
E.
若反馈电阻为热敏电阻,应该使用正温度系数的热敏电阻。
F.
若R1为热敏电阻,应该使用正温度系数的热敏电阻。
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