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difference between gds and gdsii
for me , i think, if the device is working in deep linear range, the Ron=1/gds, but if working in saturature range, you can not say that, you can see small signal model, the r0=1/gds
Re: Hspice question
i do not know how to realize, but i think the calculator in waveform display tools is a good choice.
ps: how to realize it in eldo?
you want to know how to do transient analysis for a LDO
i think, you can do like this:
1: give no current output to check the stability, you can see the when the system is power on, there is a dump oscillation or not.
2: give max output current to check the drive ability. see the output voltage...
i am afraid, the pass element's W/L is too small, i can not believe W/L =6 can drive out 100mA's current, you'd better re-design it .
by the way , i think you spec is easy realized, if you find your LDO is not stable, you'd better show what compensation you use, where is the domain pole. and...
Re: bandgap problem,also
when simulation, the bandgap is not always die. why we need a startup circuit ,that is because there is a mismatch.
the dead point, you must set the point which will make your circuit un-work
i think it is for power supply noise consideration and ESD
the MOS is connected to VCC, and the p-sub is connected to VSS.
it just use the NWELL and the sub as a inversly PN-junction. so that when power noise or ESD charge voltage more than inversly PN-junction voltage, it can filter the high...
i think you can use a charge pump that has a NMOS source follow output to small the output capacitor.
you can find papers on IEEE, keyword charge pump, memory.
i use linux now and do not have a paper. otherwise i can upload some papers for you
Re: Bandgap Reference
i think you can still use bandgap,
the bandgap that base on current independent can get a voltage high than 1.2V
by the way, LDO is not a good idea, LDO is designed to drive large current not here.
Added after 1 minutes:
you can do it as a AC sweep.
the difference...
usb1.1 impedance
in USB1.1's specification, there is a request that the impedance of each of the drivers mst be between 28ohm and 44ohm
my question is : when we design the PHY, how to simulate the driver impendance? DC sweep the output current and voltage or transcient simulation and then give...
Re: Bandgap Reference
you amp need a so accurate bias?, usually, what a amp really need is a bias current and some times a reference input voltage, if you need a bias current , you can use a bandgap, and then a current mirror is used to give the bias.
if you need a reference input voltage...
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