problems in recevier simulation with ADS

I'm now stimulating a FM receiver.
1.anybody knows how to install the based different band signals with FM carrier at antenna.
2. how to create a model of a "Frequency pulse counting discriminator" which severs as a low_if demodulator in the receiver.
3.how to use the DFF which severs as a zero-if demodulator in the analogy schematic?

Thankyou for your infomation.
my e-mail: flora.sang@hotmail.com

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