clock xtal multiplier help
- Thread starter raffter
- Start date
Hello,
Multiplying can be done with a Phase Locked Loop.
http://www.educypedia.be/electronics/pll.htm
In a PLL an oscilator can be compared with a reference.
If you divide the oscillatorfrequency you will get a stabelised frequency that is mutiplied by the division factor.
Greetings,
Bertus
Multiplying can be done with a Phase Locked Loop.
http://www.educypedia.be/electronics/pll.htm
In a PLL an oscilator can be compared with a reference.
If you divide the oscillatorfrequency you will get a stabelised frequency that is mutiplied by the division factor.
Greetings,
Bertus
I was hoping for a simpler approach(just to clock a PIC)Hello,
An other posibility is multiplier stages.
A multiplier stage is a non linear amplifier with a tuned circuit at the multiple of the input.
Multply stage follow for 100 X are 2 X 2 X 5 X 5 X.
But 5 X stages are nor so easy.
Here is some text from a radioamatuer page.
FREQUENCY MULTIPLIER
The oscillator is generally designed to operate on a low frequency, because it is more stable. In order to achieve output on the higher frequencies, it is necessary to employ one or more stage of frequency multiplication. An advantage gained from this arrangement is that by operating the oscillator at a relatively low frequency, it is easier to achieve the necessary frequency stability. A single multiplier stage may produce twice the fundamental frequency (frequency doubler) or three times (tripler) or more. Usually, however, the frequency multiplication in one stage is limited to three. It is undesirable to feed the antenna directly from a multiplier since harmonics, other than the wanted signal, are produced and maybe radiated simultaneously.
Greetings,
Bertus
An other posibility is multiplier stages.
A multiplier stage is a non linear amplifier with a tuned circuit at the multiple of the input.
Multply stage follow for 100 X are 2 X 2 X 5 X 5 X.
But 5 X stages are nor so easy.
Here is some text from a radioamatuer page.
FREQUENCY MULTIPLIER
The oscillator is generally designed to operate on a low frequency, because it is more stable. In order to achieve output on the higher frequencies, it is necessary to employ one or more stage of frequency multiplication. An advantage gained from this arrangement is that by operating the oscillator at a relatively low frequency, it is easier to achieve the necessary frequency stability. A single multiplier stage may produce twice the fundamental frequency (frequency doubler) or three times (tripler) or more. Usually, however, the frequency multiplication in one stage is limited to three. It is undesirable to feed the antenna directly from a multiplier since harmonics, other than the wanted signal, are produced and maybe radiated simultaneously.
Greetings,
Bertus
Last edited:
Hello,
A crystal frequency can change only about 700 ppm with the capicators.
See the crystal design notes.
http://www.foxonline.com/pdfs/xtaldesignnotes.pdf
On this page there are more links about crystal acillators.
http://www.educypedia.be/electronics/analogoscicrystal.htm
Greetings,
Bertus
A crystal frequency can change only about 700 ppm with the capicators.
See the crystal design notes.
http://www.foxonline.com/pdfs/xtaldesignnotes.pdf
On this page there are more links about crystal acillators.
http://www.educypedia.be/electronics/analogoscicrystal.htm
Greetings,
Bertus
Last edited:
sanjay04313
- Joined Aug 19, 2008
- 2
send me full information about single stage amplifier
Kind of late, but DigiKey has 3.2768MHz crystal oscillators in stock; over 400 of them.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=852334;keywords=3.2768MHz
Sanjay04313,
you are "hijacking" the topic, which is very much frowned upon. If you wish to start a new topic, please do so. However, we generally do not "send" information to a poster; instead replies are made to the thread. You can elect to be notified about additions to your thread by clicking the "subscribe to this thread" button.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=852334;keywords=3.2768MHz
Sanjay04313,
you are "hijacking" the topic, which is very much frowned upon. If you wish to start a new topic, please do so. However, we generally do not "send" information to a poster; instead replies are made to the thread. You can elect to be notified about additions to your thread by clicking the "subscribe to this thread" button.
