Electronics Handbook/Devices/Oscillator/Active Oscillator/Single Frequency Oscillator or SFO

Single Frequency Oscillator or SFO
Single Frequency Oscillator or SFO is made up of class A Transistor Amplifier with feedback circuit consists of parallel LC Tuned circuit or a RC phase shift of 180o

Parallel LC Tuned Circuit
The Oscillating Frequency is calculated by
 * $$f = \frac{1}{2 \pi} \sqrt{\frac{1}{lC}}$$

RC phase shift of 180o
The Oscillating Frequency is calculated by
 * $$f = \frac{1}{2 \pi} \frac{1}{RC} \frac{1}{Tan \Theta}$$