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How to understand this circuit?newbie-question

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konloun

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this is from AWR example, I think only M1(in the middle) is needed , confused with the other two FETs
"
Many times designers want to tune their circuits with digitally controlled capacitance. This schematic has such a block, in the schematic called “Tune_Cap”, in this case it is a differential circuit. When the control signal is high, the circuit will see the two capacitors, when low, this circuit will be an open circuit. "
1.PNG

Thanks
 
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