Pierce-gate quartz oscillator worksheet

Post new topic   Reply to topic

Go down

Pierce-gate quartz oscillator worksheet

Post by arb-92 on Tue Mar 13, 2018 9:06 am

Doh! Rookie mistake... Of course, in a shunt case like RB, no resistor means RB = infinity (by oppostion to a series case like RS, where no resistor means RS = 0 Ω, or a link...). Outside math, the concept of infinity being of no use to us, the sentence should simply read:
" In the case of microcontroller or ASIC ICs, RB may be redundant as it is already embedded in the IC: RB should then be left out."
Thank you, Ivan, for picking it up!
ARB

arb-92

Posts : 4
Join date : 2018-02-21

View user profile

Back to top Go down

Re: Pierce-gate quartz oscillator worksheet

Post by Ivan on Tue Mar 13, 2018 7:24 am

Hi Arb,
thank you for your effort and kind giving its results for free use. I have one small correction only. You wrote
" In the case of microcontroller or ASIC ICs, RB may be redundant as it is already embedded in the IC.
Then, RB = 0 Ω."
This would short the input and output of the gate. IMHO RB must be infinity in this case (i.e. no external resistor is needed).


BR from Ivan

Ivan

Posts : 228
Join date : 2012-11-25
Location : Praha, Czechia

View user profile

Back to top Go down

Pierce-gate quartz oscillator worksheet

Post by arb-92 on Tue Mar 13, 2018 12:17 am

Hello,
For your perusal, please find herewith a link to an Excel spreadsheet giving preliminary design values for the passive components associated with a Pierce-gate quartz oscillator, today the prevailing clocking circuit for digital ICs.
The complexity of the non-linear dynamics at stake usually makes an iterative (trial and error...) process almost mandatory for more advanced optimization, but hopefully those design values are a good starting (working) point.

http://213.114.131.21/draw/pierce-gate-osc-calc.xls

Also given herewith is a link to a work document explaining the logic behind those design values (hopefully...), and is sampled from my reading notes while researching the subject.

http://213.114.131.21/draw/quartz-ii.doc

Feel free to use the worksheet, provide comments and eventually suggest corrections when warranted. Thanks!   
Best,
ARB

arb-92

Posts : 4
Join date : 2018-02-21

View user profile

Back to top Go down

Re: Pierce-gate quartz oscillator worksheet

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

Post new topic   Reply to topic
 
Permissions in this forum:
You can reply to topics in this forum