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[Questions] ADS simulation on FM TX circuit

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Hi all,

i'm draw the this circuit using ADS, refering to the schemetics. I've simulated it and everything is working fine, the frequency changes when the input voltage changes. However, I have a few questions about the circuit.



1, What"s the function of C8 and R1 (base of the oscillator)? Is it just a coupling capacitor?

2, How can I show that the frequency changes with voltage (in one graph, X=freq, Y=voltage). Currently, i change the value of the input voltage and simulate the whole thing again. I try using parameter sweep but have error in simulation. Can someone advice me?





Thanks in advance

Alex

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