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Simulate negative frequency for polyphase filter

Question asked by tigrachien on May 23, 2006
Latest reply on Aug 1, 2006 by saul
Dear Sir,
I want to design polyphase filter, but I find out ADS can't simulate negative in AC and HB mode.
And I try to use S-parameter mode and insert 2 ideal amplifiers(port1 and port2) to transfer impedance from 50ohm to 50000ohm, because I use voltage transfer function(ex:1/2piRC). But It can't match on voltage transfer function.
Who can resolve my question???    

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