More specifically he digs deep into the workings of crystal oscillators and even takes apart some vintage crystals to reveal whats inside! Im having a teeny problem. I cant get my reader to pick-up your feed, Im using aol reader by the way.
Hello, im having problems designing my own crystal oscillator. I dont know where to begin with or what capacitances will be placed with a 4MHz crystal chip. Can you help me? Is that right? I also presume at least part of that lowered quality would result from the characteristic noise level from those discrete component. If you are talking about phase-noise as the criteria, it depends mostly on the quality factor of the resonance circuit and general noise from the active components of the oscillator.
LC oscillators can be very good in terms of noise. An oscillator that uses an RC for its timing does not use resonance but rather a time constant for setting the frequency, like a ring oscillator or the PWM generator in the next video. Loved your tutorial.
But the spectral analysis of the XO square wave, showed even and odd harmonics, and the amplitude did not decay as quickly as I would expect. Comment please? Thank you for your very observant remark! Yes, you are right about the spectral content of an ideal square wave.
The spectrum should only contain odd-mode harmonics which decay as a Sinc function does with frequency. However, you must consider that the square Phase Music 2 Part 3 - Dissecting Table - My Oscillator generated by the crystal oscillator although it looks visually close to being a square wave contains other frequency components.
Even so, you can see from the spectrum that the second harmonic is much weaker than the third harmonic. I suspect that the second harmonic is generated through self mixing and general non-linear effects from the final amplifier or driver in the crystal oscillator. To preserve strict spectral purity of a square wave, the driving circuit must be infinitely linear, which of course it is not.
I am a simple math and Physics teacher, and as I came across your website I just thought to have a look on it. I have to admit that I ended up following carefully every single instant of it, and I am literally amazed.
It was on every sense a real lesson for me. I am sure I will come back to your website. I was an EE major for about 2 years Phase Music 2 Part 3 - Dissecting Table - My Oscillator I dropped out to start a business, so I missed a few lectures… now heading down the electronics rabbit hole on my own, with help from guys like you. Thanks so much for the detailed explanation and examples.
I can appreciate the amount of work that goes into making something like this, and just wanted to say thanks for doing it. My husband and i felt absolutely delighted when Chris managed to finish up his investigation through the entire ideas he Soldier Of Love - Pearl Jam - Noblesville, IN - June 22nd 2003 from your very own blog.
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Thank you for taking the time to leave a comment. I feel that the dissemination of knowledge is a fundamental human responsibility. We stand on the shoulders of giants in order to reach a little higher, to comprehend the universe one step further. We owe it to ourselves to share what we have learned. I hope that you would find our future videos as useful. I precisely wished to thank you so much once more. It was actually a frightful case in my opinion, howeverunderstanding your specialised form you processed that took me to jump for gladness.
Extremely happy for your help and even expect you really know what a great job you were putting in instructing the rest by way of your site. Thank you for your kind words! There will be more videos with interesting experiments. Stay tuned! Introduction - Mentz - Relocate EP question is this: what field do Phase Music 2 Part 3 - Dissecting Table - My Oscillator work in so that you can afford these things???
It really is not as much as you think. For example, the HP counter can be bought for less than 1k. My synthesizer for example was in bad shape when I got it, it took two weeks to find out what was wrong with it and fix it. Ring oscillators can obviously be used for Voltage and temperature variant oscillators, useful if you want to convert changes in temp or voltage to frequency and Obviously they are cheap, Is there any other advantages to the ring?
Also could you clean up the signal make into a better square wave generated with such a crude oscillator with something like a comparator with a sharper edge? It is true that ring oscillators change with temperature, but a good temperature controlled oscillator would need to be much more predictable and well modeled.
Ring oscillators are simple, and can be used in PLLs to reduce their drift and phase noise. They also can be made in CMOS very easily and require no monolithic inductors. A great presentation. I enjoyed watching the whole thing and learned quite a bit. I look forward to seeing more videos from you! Great video. Nice that you covered the theory — I stayed glued to my screen for the entire duration. Very good. Also an interesting look at the lengths designing better end more stable oscillators are begin done!
Bet its wierd powering up those oven controlled Boss (Accapella) - Stoloff & Hopkinson - Extravaganza EP for the first time not knowing they heat up! Thank you so much for the great video! I found it very informative. That was a huge crystal at Compartment - Stylus - Remixing: The Last Seaweed Collecting Hut At Freshwater West end.
Very cool! Thanks again. I am glad you found it informative. Yes, that huge crystal is pretty amazing! The fact that it can drive a 50Ohm load directly is very useful for RF application, it actually produces 20dBm of output power! Very nice tutorial! Clear and concise with good quality audio and video. Thanks for sharing and I will be looking forward to more. Reached your blog post through Stumbleupon. You already know I will be signing up to your rss feed.
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