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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> output load consideration https://designers-guide.org/forum/YaBB.pl?num=1131079753 Message started by vijay on Nov 3rd, 2005, 8:49pm |
Title: output load consideration Post by vijay on Nov 3rd, 2005, 8:49pm Hi friends, I have a symmetric load differential VCO.How do I take care of the output load considerations in my design? Or how do i design my VCO with fanout considerations. Thanks in advance. |
Title: Re: output load consideration Post by ywguo on Nov 7th, 2005, 8:09pm Hello, It's just a capacitive load, which affects the oscillating frequency of the VCO. :) Yawei |
Title: Re: output load consideration Post by vijay on Nov 9th, 2005, 2:06am Thanks, But what I meant to say that, if I use this VCO in a PLL circuit, which in turn is acting as a clock.Then there has to be certain consideration for the load which the PLL has to drive.This is like fanout consideration in the digital design side.Since it will be the VCO which has to drive the load so how do I design a VCO taking this fanout or load consideration. |
Title: Re: output load consideration Post by ywguo on Nov 21st, 2005, 9:12pm Vijay, Normally the PLL block must have digital interface. You'd better put some inverters at the output of the VCO. Then the unpredicted digital design don't load the VCO directly. Best regards, Yawei |
Title: Re: output load consideration Post by uncle_ezra on Nov 22nd, 2005, 12:57am Well normally u have a buffer in between so you can design them sort of independently. |
Title: Re: output load consideration Post by vijay on Nov 27th, 2005, 8:18pm Thanks, This is the output buffer design, I got it. Thanks. V |
Title: Re: output load consideration Post by singh on May 30th, 2011, 5:22am can ushare the buffer design?? i designed my VCO keeping 1pF at the load but if i increase load capacitance,the oscilation frequency increases.Please let me know the buffer design |
Title: Re: output load consideration Post by loose-electron on May 30th, 2011, 6:09pm singh wrote on May 30th, 2011, 5:22am:
um, probably decreases.... |
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