PLL's - The Voltage Controlled Oscillator (VCO)

#115 This time I continue looking at another fundamental block used in a phase locked loop (or PLL), the voltage controlled oscillator, or VCO in short. I take a look at the 2 fundamental types commonly used - the relaxation and the harmonic oscillator and then inquire how the output frequency can be modified using an external voltage. Datasheets: https://www.ti.com/lit/ds/symlink/cd4046b.pdf Tested circuit schematics: Harmonic oscillator: https://drive.google.com/file/d/1G3DJ4b3gDER5PZvg-r_25B1iVif1ien-/view?usp=sharing Relaxation oscillator: https://drive.google.com/file/d/19J15X-xdLoZBxtg-zVPOl4X0h0UI3pDU/view?usp=sharing More on PLL's: Frequency multiplication: https://youtu.be/VqcMGULfPjg FM demodulation: https://youtu.be/d6ufJtyX6XA The Phase Detector: https://youtu.be/uTaZ6uL1t-U The VCO: https://youtu.be/JjoO59CY_UQ References and further reading - The Art of Electronics; Horowitz, Hill; Cambridge; Cap 13.13 Special Thanks to all my supporters on Patreon! Especially @afiskon and Ralf B.! If you liked this video be sure to check out my other videos and you can also subscribe to be up to date with all the new ones! If you want to support the creation of more and better videos please consider checking out: https://www.patreon.com/feszelectronics