Evaluation board of HMC221BE is shown below in data sheet.
1KOhm resister was used in control input A/B line.
Is the resister mandatory?
If yes, what is role of the resister?
Thanks in advance.
The HMC221BE's control inputs (A and B) are connected to the gate of FETs. The series R=1kohm on the control inputs and the capacitance on the FET channel will form a RC filter that helps filter off the high frequency leakages coupled through control inputs. The series R can be eliminated if the control signals are clean or its value can be chosen according to system requirements.
Retrieving data ...