do we need stability analysis for bias circuits

[satyasiva]

I have a doubt that whether we need stability analysis for supply independent bias circuit.

 

[Btrend]

sure, it is needed if ur system is closed-loop.
however, if the system is open-loop, then no stability analysis is needed.

 

[nxing]

For any closed-loop system, you need to simulate the stability, or you need to know at know, it's stable or oscillating according your requirement.

 

[satyasiva]

tell me whether we need stability analysis for following circuit.

 

[xcoder]

tell me whether we need stability analysis for following circuit.

there would be too many operating point, I think you'd better add a resistor in your ckt.
the self-bias loop is stabile because the loop-gain<1, but gain Margin is useful for the evaluation of the startup time.

 

[pfd001]

You schematic can't work. Normally, you should check the stability of the close loop

 

[qutang]

does it need a startup or else compensation?

 

[satyasiva]

tell me whether we need stability analysis for following circuit.

there would be too many operating point, I think you'd better add a resistor in your ckt.
the self-bias loop is stabile because the loop-gain<1, but gain Margin is useful for the evaluation of the startup time.

ok, if i add a resistor between NM0 and gnd to get a fixed current, then tell me about the stability of circuit. wat type of feedback we have here? I.e., positive, negatie?

 

[xcoder]

to: satyasiva