Do you have data that details the minimum input power required for the HMC426 when using a bias resitor? Please refer to the Hittite app. note FREQUENCY DIVIDER OPERATION & COMPENSATION WITH NO INPUT SIGNAL.
The only time that the shunt resistor may be needed on the input of this device is if self-oscillations or false triggering is present in the absence of an input signal when the device is biased on. If an input signal will always be present there's no need for it and in fact will unnecessarily degrade the input sensitivity. It's been found that when operating the HMC426MS8G at a nominal 3.0 Vdc bias, a 6.2kΩ resistor is sufficient to prevent self-oscillation and false triggering over the operating temperature range of -40°C to +85°C. The input sensitivity is limited to approximately -15dBm. At lower bias levels and / or due to process variation the user may find that this value may need to be decreased slightly if proper operation is not achieved.
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