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Direct modulation in PLL without up conversion mixer

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wireless man

wireless man

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What system is feasible in implementing direct modulation in PLL without up conversion mixer?
GMSK? QPSK? or others?
Thanks
 

Hello,

You could use translational PLL for constant envelope modulation like GMSK and QPSK
 

    wireless man

    wireless man

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yeah i agree with RFCMOS , PLL can only modulate the phase and frequency ,

but others like QAM and so on , no

Khouly
 
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