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VCO(voltage controlled oscillator) in PLL

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Re: PLL

According to the usage of the PLL
What is your PLL used for?
best regards,
Rania
 

Re: PLL

VCO(voltage controlled oscillator) is a voltage to frequency converter.
in PLL the output of phase detector i.e. the dc voltage proportional to the frequency difference is applied to VCO. VCO changes its own frequency to generate same frequency same as that of input slg. frequency. so that error voltage is zero.
 

PLL

LC for high frequency, low phase noise VCO, ring for large tuning range
 
Re: PLL

If you like to have large tuning range as well as small area use Ring Oscillator
if you need high purity use LC
I hope I came to the point
best regards,
Rania


dinesh agarwal said:
lc vco the range in percentage of full operating range
Click to expand...
 

PLL

lc vco =q high,area large,high frequency design
ring= small area ,easier to design, preferred for low freq,q low
 

Re: PLL

- ring VCO: small area , poor phase noise , suitable for applications that require relaxed phase noise requirements mainly wired applications

- LC VCO : bigger area , better phase noise , suitable for applications with tough phase noise requirements like wireless applications
 

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