Uploaded April 2021 | Updated September 2026, 1 week ago
#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:
ti.com/lit/ds/symlink/cd4046b.pdf
Tested circuit schematics:
Harmonic oscillator: drive.google.com/file/d/1G3DJ4b3gDER5PZvg-r_25B1iVif1ien-/view?usp=sharing
Relaxation oscillator: drive.google.com/file/d/19J15X-xdLoZBxtg-zVPOl4X0h0UI3pDU/view?usp=sharing
More on PLL's:
Frequency multiplication: youtu.be/VqcMGULfPjg
FM demodulation: youtu.be/d6ufJtyX6XA
The Phase Detector: youtu.be/uTaZ6uL1t-U
The VCO: 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: patreon.com/feszelectronics
#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:
ti.com/lit/ds/symlink/cd4046b.pdf
Tested circuit schematics:
Harmonic oscillator: drive.google.com/file/d/1G3DJ4b3gDER5PZvg-r_25B1iVif1ien-/view?usp=sharing
Relaxation oscillator: drive.google.com/file/d/19J15X-xdLoZBxtg-zVPOl4X0h0UI3pDU/view?usp=sharing
More on PLL's:
Frequency multiplication: youtu.be/VqcMGULfPjg
FM demodulation: youtu.be/d6ufJtyX6XA
The Phase Detector: youtu.be/uTaZ6uL1t-U
The VCO: 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: patreon.com/feszelectronics
![EMC tutorials - [2/3] Testing the LISN](https://i.ytimg.com/vi/nq-IhHbZdD0/mqdefault.jpg "EMC tutorials - [2/3] Testing the LISN
#117 In this video I start testing the LISN to see just how good it is. I look at multiple things starting with output impedance then go for insertion loss, input impedance and input side filtration and finally look at inter-channel isolation or cross talk.
More on the topic:
Part 1: https://youtu.be/OEvkRW5vZNA
Part 2: https://youtu.be/nq-IhHbZdD0
Part 3: https://youtu.be/M_ab0Oz2ypI
Website with CISPR limits:
https://www.com-power.com/products/lisns/li-3100
Further reading:
AN-7_Measuring_a_Line_Impedance_Stabilization_Network(LISN) - https://coretechgroup.com/wp-content/uploads/2017/01/AN-7_Measuring_a_Line_Impedance_Stabilization_NetworkLISN.pdf
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")
