Wideband Gain=20 dB, UGBW=5GHz

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vahid_e70

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Dear friends,

I am looking for a structure for a wideband amplifier(single stage is preferred) and my specifications are Gain=20dB, UGBW=5GHz.
I found a basic structure on "https://sites.google.com/site/randomwok/Home/electronic-projects/wideband-pre-amplifier-using-discrete-transistor" but I don't know how to design it? It was simulated on ADS but the result with and without feedback(560 ohm) were the same. It seems this circuit is very popular and is in different notebooks. I would appreciate it if you could help me to design this circuit or suggest a reference for this circuit(or other single stage circuit with the same spec) .

Thanks so much,
Vahid
 

Hi vahid_e70,

What are you trying to achieve? If this is a learning experience, I'd suggest narrowband. Easier to match. Take a look at opamp design. You will see similarities to the specific design you reference. There is a lot to matching amplifiers. Stability is a hot button to say the least.
 

Hi ge,
Thanks, I am working on a lab manual and it is necessary to get aforementioned specifications. And we don't want to use Op-Amp.As I mentioned I have found an structure with desired specs but I don't know how to redesign it,because I need design equations.
 

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