Signal flow graph for two-port network

AI Thread Summary
The discussion centers on a query regarding a signal flow graph in a two-port network from a Maxim application note on low-noise amplifier stability. The user seeks clarification on the equivalence of two diagrams in Figure 2.4, specifically why node a2 is independent of the input bs. It is noted that the transition from the left to the right diagram requires calculating b2 as a function of bs. Additional information is requested to provide a more detailed response. The focus remains on understanding the signal flow graph's implications in the context of amplifier stability.
anhnha
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Hi, this is part of an application note entitled "Low-Noise Amplifier Stability Concept to Practical Considerations" from Maxim.
Could you help me with the question in the picture? Thanks.

Source: http://www.maximintegrated.com/app-notes/index.mvp/id/1849

https://www.physicsforums.com/attachment.php?attachmentid=67016&stc=1&d=1393322023
 
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Can you please give us a little more information.
Which figure or diagram are you referring to ?
What is your actual question ?
 
Thank you. I thought I figured it out.
My confusion was from why the left diagram is equal to the right one in Figure 2.4. I was told that node a2 doesn't depend on the input bs and therefore to change from left diagram to the right one all I need is to calculate b2 as a function of bs.
 

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