QwErTzY
Junior Member level 1
I am designing a unity gain buffer.
i have done the simulation in dc, ac and trans.
when i try to look at the phase, something weird appears. please see the attachment. the phase starts at -180deg instead of 0deg
the final phase is stable, only the initial seem odd. the 2.7~5V supply does not have such a problem execpt at around 5.5V.
when i run the trans simulation, the waveform seems normal with a overshoot then damp down to a stable level. both the 5V and 5.5V is having about the same waveform. both without ringing etc etc.
I have look at the operating points of all the transistors. they are in the correct operating region. I have compare the 5.5V and 5V operationg points etc, they are about the same too.
have anyone seem such a waveform(phase) before? by any chance, is it the simulator problem?
i have done the simulation in dc, ac and trans.
when i try to look at the phase, something weird appears. please see the attachment. the phase starts at -180deg instead of 0deg
the final phase is stable, only the initial seem odd. the 2.7~5V supply does not have such a problem execpt at around 5.5V.
when i run the trans simulation, the waveform seems normal with a overshoot then damp down to a stable level. both the 5V and 5.5V is having about the same waveform. both without ringing etc etc.
I have look at the operating points of all the transistors. they are in the correct operating region. I have compare the 5.5V and 5V operationg points etc, they are about the same too.
have anyone seem such a waveform(phase) before? by any chance, is it the simulator problem?
