Gain & Error voltage

HI,

The HMC439 PFD looks at the frequency of REF and VCO, not at their input power. But the input power has to be between -10dBm and +10dBm for the PFD to function correctly.

See a paper like MT-086 (https://www.analog.com/media/en/training-seminars/tutorials/MT-086.pdf) to understand how a PFD works as part of a PLL.

Petre

For a certain constant phase difference between REF and VCO,  will the ouput error volatage change if the REF or VCO power varies from -10dBm to +10dBm?

Hi,

the HMC439 outputs are NU and ND signals. If REF or VCO change power while the phase offset between the clocks remains constant, the HMC439 outputs should not change their existing behavior.

Petre

Hi,

the HMC439 outputs are NU and ND signals. If REF or VCO change power while the phase offset between the clocks remains constant, the HMC439 outputs should not change their existing behavior.

Petre