Stability in PA Designs

[rd_dinesh]

I saw a PA design in a journal which is unstable at the operating frequency. so is it okay to have an unstable design?

 

[andre_luis]

so is it okay to have an unstable design?

How can one in this world answer this question for you?
Stability is not a binary quantity, but assessed by quality factors ( damping, oscillation )

I saw a PA design

BTW:
Unless previously contextualized in the thread, avoid using abbreviations, particularly when the question is not that elaborated.

 

[rd_dinesh]

How can one in this world answer this question for you?
Stability is not a binary quantity, but assessed by quality factors ( damping, oscillation )


BTW:
Unless previously contextualized in the thread, avoid using abbreviations, particularly when the question is not that elaborated.

PA - Power Amplifier

 

[tepalia02]

An unstable PA design is not ideal and may require additional efforts to achieve stability. It is crucial to address the stability issues before considering the implementation of the design in practical applications.

However, if you have already made a design, you can post this question along with your design here:

Electrical Engineering about PCB - PCBWay

 

[albbg]

I think the journal refers to a PA that is conditionally stable, that means it can be stable or unstable depending from load and/or source impedance.

 

[BigBoss]

If the PA is Conditional Stable, it might oscillate or NOT
If the PA is Unconditional Unstable, it will definitely oscillate.
PAs are designed as unconditional stable as much as possible but conditional stability can be an option with danger of oscillation.

 

[vfone]

is it okay to have an unstable design?

To answer exactly to your question: NO is not okay to have an unstable PA.
Actually, is not okay to have any RF stage unstable, whatever is an LNA, Mixer, IF amplifier, demodulator/modulator, and even an oscillator. Yes an oscillator, which should have a controlled (in)stability (positive feedback), otherwise will have poor characteristics in terms of: frequency stability, phase noise, or start-up.