Why does the HMC440 phase detector not work with reference frequencies lower than 20 MHz, and how can this issue be resolved?

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Accepted Answer

The HMC440 phase detector may not work with reference frequencies lower than 20 MHz due to insufficient slew rate of the input signals. To resolve this issue, ensure that both the reference and VCO input signals are square waves with high slew rates. Additionally, the amplitude of the reference signal should be at least 650mV rms, which corresponds to a power of 9.27dBm at 50 ohms.

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HMC440 : FAQ