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The design guide section of ADS for Mixer design
I used "design guides" of ADS for mixer simulation. In this section, the conversion gain of the example mixer has a negative value! As you know the typical value of conversion gain for a mixer is about 10dB (RF Microelectronics, Razavi).
Is it possible to have a negative value for conversion gain of active mixer.
Thanks,
Rosa
It's possible... it means you used a wrong load..
the default conversion gain in "mixer design guide" is power conversion gain, and it do has negative value!
you can name the i/o pin, and get the voltage conversion gain such as:
ConvGain_voltage=dbm(mix(HB.Voutp,{1,-1}))-dbm(mix(HB.Vinp,{0,1}))
if f_LO > f_RF
it can happen , if u didn't adjust the load ,and the gm of the transconductor pair , also check the matching so u get the max output
khouly
Passive mixer definitely introduce negative conversion gain (or in other word, conversion loss).
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