One method is to alternate N and P type. It makes for convenient biasing. Gains are multiplied. Similar to a sziklai pair.
I used inductor between one stage to next stage since inductor will bypass dc components.
Have you seen this PNP design approach for LNA in the GHz range? I haven't seen much use of PNP, but might be wrong.
I would like to design multistage LNA to improve gain. I used inductor between one stage to next stage since inductor will bypass dc components. What best circuit or component can be used to connect one stage to next stage and next stage to further next stage.
Once I used parallel inductor between one stage to next stage and fabricated LNA , I couldn't get results at all. What is the best way to design two or three stage LNA.
Below attachments I have designed Single stage LNA, later extended same single stage LNA design to second and third stage. Please give suggestion on what best circuit or component can be connected one stage to next stage LNA design.
I have attached below single stage LNA, second stage LNA, and third stage LNA.It is not clear what you are trying to do. A single series C will be enough to for DC separation, no need for inductors unless you want to build additional high pass response.
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The concept of a multi-stage LNA is somewhat dubious, IMO. I strongly think you should focus on building a robust single-stage LNA (unconditional stability, if possible).
Yes sometimes a single LNA stage doesn't have sufficient gain. But normally this is done by cascading a single stage LNA with a more general-purpose gain block stage, rather than cascading multiple LNAs. Or, if there's a frequency conversion in the signal chain, putting the extra gain after the mixer (an IF amplifier).But some applications, we must require large gain as alone single stage will not give more gain. We should design multistage LNA.
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