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Figure 2-18A.—Three-section, phase-shifting RC network. PHASE-SHIFT NETWORK C1 AND R1.
Figure 2-18B.—Three-section, phase-shifting RC network. PHASE-SHIFT NETWORK C2 AND R2.
Figure 2-18C.—Three-section, phase-shifting RC network. PHASE-SHIFT NETWORK C3 AND RB.
A high-gain transistor must be used with the three-section RC network because the losses in the
network are high. Using more than three RC sections actually reduces the overall signal loss within the
network. This is because additional RC sections reduce the phase shift necessary for each section, and the
loss for each section is lowered as the phase shift is reduced. In addition, an oscillator that uses four or
more RC networks has more stability than one that uses three RC networks. In a four-part RC network,
