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The design guide section of ADS for Mixer design

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rosaeidi

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Hi everyone,

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..
 

rosaeidi said:
Hi everyone,

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
Click to expand...

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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