help! targets in designing amplifier with @DS!

[yelso]

i am a freshman in rf field.
recently i am studying the amplifier, and i am comfused in what targets we want to get in designing with @DS. we know power gain, noise figure and output power are needed, but my question is other coefficients such as harnomic etc. are needed too?
thank u!

 

[Grig]

Hi

You can simulate and optimize Noise Figure, S-parameters, toi..... using ADS
It's needed if you design amplifier

Regards

 

[Manjunatha_hv]

It depends which Amplifier you are designing & Analysing...
1. Power Amplifier(PA)
2. Low Noise Amplifier (LNA)

PA Analsis
Single tone distortion
Multitone distortion
AM-AM, AM-PM
PAE ( power added efficiency )
Gain
Noise Figure
Power Spectrum
TOI, ete

LNA Analysis
Gain
NF
Stability
Sparameters, etc

All you can do analysis or optimization using powerful RF & MW CAD tools
like Microwave Office or ADS

 

[yelso]

thank u!

now i am designing a LNA.

i have the data sheet of the transistor and the S parameter, but the transistor is not in the compenent library of the @DS.

my question is how to do with @DS in the first step.

to use the S2P compenent and then import the .s2p????
and how to design the match network??also with the S2P compenent???

thanks again!

 

[toonafishy]

You can use the s parameter Data Element. In the data element, you can point to the S parameter file. Then you can put a TERM on the input and output. The matching circuit would go between the TERM and the data element. Remember, this is a linear simulation only. You can match and get gain and noise figure but you need the non-linear model of the transistor to do distortion analysis.

 

[yelso]

thank u!

your advise is very helpful!

but how to simulate the bias network with Data element?

thanks again!

 

[sunn]

Basically You can't do DC simulation if you only got S-parameters data, you need a non-linear or spice model.

 

[vale]

Transistor datasheet will tell you on what DC condition the is abtained. Normally, demo bias network will be also provide. And you can check I-V curve or other graph to build bias circuit.

 

[yelso]

thank sunn, and all!

you really inspire me in this design.

thank you!