Current transistor-transistor-inductor oscillator

An original and very simple design of an oscillator is presented. It used only three components: two transistors and one earthed inductor. The circuit gives a constant quasi-square output with a periodic time proportional to its input current. The oscillation modes, the oscillation conditions and the effects of nonideal devices are discussed, and some simulated results are given. Next, a related design is discussed which uses a short-circuited delay line in place of the inductor. Finally, the relation between frequency and current is shown along with the temperature dependency for real implementations, and some possible applications are suggested