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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> 32kHz oscillator design https://designers-guide.org/forum/YaBB.pl?num=1360118454 Message started by ic_engr on Feb 5th, 2013, 6:40pm |
Title: 32kHz oscillator design Post by ic_engr on Feb 5th, 2013, 6:40pm Folks i am in the midst of finalizing a topology for xtal oscillator design. The choice I have is either pierce oscillator or differential relaxation oscillaotor with on-chip capacitor. Apparantly I am having conflicting opinions regards to relaxatin oscillator consuming less current than the pierce. Any suggestions ? ic_engr |
Title: Re: 32kHz oscillator design Post by loose-electron on Feb 8th, 2013, 6:43pm how accurate do you need the 32KHz for a real time clock? RC oscillators are not accurate. |
Title: Re: 32kHz oscillator design Post by Lex on Feb 11th, 2013, 1:41am Free running RC oscillator (I guess you mean relaxation oscillators) is not accurate indeed. What about one that is injection-locked? |
Title: Re: 32kHz oscillator design Post by ic_engr on Feb 11th, 2013, 5:48am Sorry, I may have been misunderstood. I am referring to two topologies for crystal oscillator. Not RC vs. Pierce. Using the crystal at 32kHz, which topoloogy is advantageous for power consumption and start-up time: 1. Pierce oscillator with crystal 2. Differential Relaxation oscillator with onchip C it has cross coupled NMOS with current sources and the crystal is connected across it. ic_engr |
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