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Frequency Synthesizer Using Discrete Components

Question asked by JF94 on Feb 25, 2018
Latest reply on Feb 27, 2018 by dyoung1

Hi All,

I want to design a high-performance frequency synthesizer using discrete VCO, PFD and frequency divider. HMC385, HMC984 and HMC983 seem good components for my design. The tunning voltage of HMC385 is from 0 to 10 volts.

I was wondering that, is HMC984 (digital phase-frequency detector with integrated charge pump) capable of providing this tunning voltage?

The maximum charge pump supply of HMC984 is 5.5v. So it doesn't seem it could provide the required tunning voltage for HMC385.

Should I use active loop filters with appropriate passband gain to provide the required tunning voltage?

Is it recommended to use HMC385 in a PLL?

 

Thanks in advance,

Jack

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