Two capacitor three-point oscillation circuit diagram

The figure below shows an oscillation circuit diagram of two capacitors and three points. The emitter of the transistor in the picture on the left is connected to terminal 2 of the three-point frequency selection network, the collector is connected to terminal 1, and the base is grounded in the AC path, so the base is equivalent to terminal 3. The single frequency-selective device connected between the emitter and the base is the capacitor C2, the emitter and the collector are connected by the capacitor Cl, and the emitter and the other two electrodes are connected by capacitors with the same reactance properties, so the emitter has satisfied ;The capacitor C2 connected between the base and the emitter, and the single frequency-selective device connected between the base and the collector is the inductor L. The inductor and capacitor are two devices with opposite reactance properties, so the base reaction is also satisfied. Figure 2 Circuit tributary The path is normal and satisfies the conditions of emission and fundamental inversion, so it can oscillate.

Looking at the picture on the right, although the configuration of the amplifier is different from that in Figure 2, according to the same-base-reverse analysis, it still satisfies the same-base-reverse emitter. The DC path is normal and the circuit can also oscillate. It is also satisfied if the phase condition is used to judge.