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Harmonic Balance simulation - RF Cafe Forums

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maniana

Post subject: Harmonic Balance simulation

Unread postPosted: Fri Mar 18, 2005 10:55 am

Offline

Lieutenant

Joined: Fri Mar 18, 2005 10:47 am

Posts: 1

Hi,

I need to sumulate a mixer (Gilbert cell).

When I run Harmonic Balance simulation everything is ok

if I put different LO and RF frequencies.

In my design I use LO=RF and I am interested in the DC

component / performance of the mixer.

The problem is that when LO=RF the simulator returns some rubbish

results or nothing at all. I tried that on Agilent ADS and Microwave Office.

Any idea what I am doing wrong? Is it some kind of limitation of the Harmonic Balance Simulation?

How to overcome this problem?

Thanks,

Przemek

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Guest

Post subject:

Unread postPosted: Sun Mar 20, 2005 9:48 am

Assuming that tthe model you are using is OK ( non linear model), then you can try and increase the number of harmonics of the simulator, although this may not help since the expected output should be a DC signal with perhaps leakage tones from the RF and LO ports. Is the simulator giving you a convergence error?

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