ideal opamp in ahdlib

[viperpaki007]

Hi,

Has anybody used ideal opamp from cadence ahdllib. I am trying to simulate it with Vsupply_p=1.2V, Vsupply_n=0V and Vref=600mV in unity gain configuration. However, for a sine wave input, output is just a constant dc voltage. I tried to change different parameter values but it did not work.

 

[LvW]

Show the circuit. Are you familiar with single-supply operation?

 

[viperpaki007]

Simulation parameters
Vin =450mV p-p
Input voltage dc-offset =600mV
Ibias =1uA
Iinmax = 1mA
Rout =10 ohm
Rin =10M
Vinoffset =0V
Gain =708
Slewrate = 825MV /sec
Unity gain freq = 1.4GHz
Vref =600m
Vsupply_p =1.2V
Vsupply_n =0V
RL =100K
CL =100f

 

[LvW]

What is the purpose of Vref ?

 

[viperpaki007]

I read from the following thread that Vref should normally be (Vp+Vn)/2

https://www.edaboard.com/threads/149631/

 

[vaah]

I read from the following thread that Vref should normally be (Vp+Vn)/2

https://www.edaboard.com/threads/149631/

Hi,

I have the same issue. I was wondering if you could let me know how you resolved the issue?

Thanks