LNA circuit Design Process Inquiry

For an LNA, following specifications have to be satisfied.

-Stability
-Gain
-Input and Output Reflections
-Noise Figure

The other metrics such as Efficiency, Class are less relevant for an LNA.
The first point that you have to involve is to find Optimum Noise Impedance. It's your starting point.

Thank you for your reply. I would like to know what steps 1 to 5 are, respectively (similar to the PA steps I mentioned above as an example). Additionally, regarding the step you mentioned, "Step 1: Find Optimum Noise Impedance," how can this be implemented in ADS? Is there a specific design guide for it?

Bailey_NTF said:

1. Select amplifier type (e.g., Class AB).

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The Class of an LNA should be mandatory and unconditional a Class-A.
Compared to a power amplifier, an LNA has much lower power, so its low efficiency is not a concern.

Bailey_NTF said:

Thank you for your reply. I would like to know what steps 1 to 5 are, respectively (similar to the PA steps I mentioned above as an example). Additionally, regarding the step you mentioned, "Step 1: Find Optimum Noise Impedance," how can this be implemented in ADS? Is there a specific design guide for it?

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Mr. Bailey,
Before starting new design, you should absolutely have a strong knowledge about what is what.
Simulators are only tools that accelerate/facilitate our design steps, no more. But having knowledge is the key to start-up a design and you have to know in all aspects how to design. Reading textbooks and doing a little bit research may help you.

Bailey_NTF said:

"Step 1: Find Optimum Noise Impedance," how can this be implemented in ADS?

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Have you tried to read/watch one of the many tutorials out there?
Here is just one of them, easily found using google search for "learning ads lna"

Bailey_NTF said:

Thank you for your reply. I would like to know what steps 1 to 5 are, respectively (similar to the PA steps I mentioned above as an example). Additionally, regarding the step you mentioned, "Step 1: Find Optimum Noise Impedance," how can this be implemented in ADS? Is there a specific design guide for it?

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Stability and gain are affected by "Input and Output Reflections",
Better noise figure is at cost of a "not perfect" input matching.
It depends of what is your main target.

I would do so:
first "Input and Output Reflections" and "stability";
then gain will come...
after check "noise figure": if this doen't satisfy you then look for "noise circles" VS "input matching GammaSource circles".
But you need to study more

Regards