The principle of developing a programmable multi-frequency oscillator based on CMOS transistors in the LT SPICE environment

The paper examines the principle of operation of a ring oscillator and the method of its implementation on logic elements in order to improve its operation through simulation and an attempt to achieve optimal characteristics. Features of the implementation of a ring oscillator in the LT Spice environment using components such as a frequency divider, frequency generator, and frequency controller were also proposed. The work investigated the operation of a frequency divider using five D-type flip-flops, from which six different frequencies were obtained (five flip-flops and one frequency at the generator output). Using LT Spice tools, time-frequency diagrams were constructed and the expected results were confirmed. The last step was to build a programmable oscillator and create a controller to set the desired frequency at the output of the device.