two questions need help - ideal switch, ptat bandgap

[lhlbluesky]

two questions need help

first, if i use a ideal switch (switch of analoglib) to simulate something, and it has 4 terminals N+\N-\NC+\NC- , then how to simulate a ideal swith use it if i want to use a pulse to control its on\off,when vclk=vdd,it is on,when vclk=0,it is off? i use N+ and N- for input and output,NC- is grounded,NC+ connects a pulse(vpulse of analoglib),but it doesn't work.pls tell me what should i do to make it work well.

second,i have a ptat bandgap(with an opamp in it),then i want to get the ac gain and PM of the opamp,then what should i do,can anyone give me the simulation circuit or some advice,pls?

thaks all for reply.

 

[PaloAlto]

Re: two questions need help

NC- should not connect to ground. It should connect -vclk

For the bandgap you must open the loop that the opamp is creating. Probably a good spot is at one of its inputs

 

[lhlbluesky]

two questions need help

i use NC- connected to -vclk,but it doesn't work also,then if vdd=3.3v, and what 's the value of open voltage and closed voltage in switch parameters?
and how to make the switch work well?

 

[antonio_eda]

two questions need help

Define a model of the switch and set its parameters.

 

[lhlbluesky]

two questions need help

but how to define a model of switch,can you say more clearly,pls?

 

[antonio_eda]

two questions need help

Goto the manual and help texts in your software...