How to simulate a PTAT circuit?

can someone show me how to set the parameter of the component for PTAT circuit?

rickxiao said:

How to simulate a PTAT circuit?

Click to expand...

Run a DC analysis and sweep the temperature.

rickxiao said:

can someone show me how to set the parameter of the component for PTAT circuit?

Click to expand...

Your question isn't clear to me: Which parameter of which component?
How is your circuit? Schematic, Verilog-A, AHDL, functional?

You may do these simulation..
-Output Voltage vs. Temperature
-Output Voltage vs Process Variations and Mismatch-Monte Carlo Simulation
-PSRR vs Temperature for different Compansation Capacitor if it's available
-Output Noise
-Start-Up vs Temperature with Corners Check<---- Very important
-Latch-Up Test

erikl said:

Run a DC analysis and sweep the temperature.


Your question isn't clear to me: Which parameter of which component?
How is your circuit? Schematic, Verilog-A, AHDL, functional?

Click to expand...

thank you for your reply, I will attached the schematic soon, as I am new here and can not add link now.

---------- Post added at 16:39 ---------- Previous post was at 16:34 ----------

erikl said:

Run a DC analysis and sweep the temperature.


Your question isn't clear to me: Which parameter of which component?
How is your circuit? Schematic, Verilog-A, AHDL, functional?

Click to expand...

I simulate the PTAT circuit in the LTspice, not include the startup circuit on the left, I set the parameter L=2u, W=100u, n=8, VDD=3v, R1=R2=100ohmic, I found the current ID1 and ID2 are not the same, ID2 is very very small.


---------- Post added at 16:45 ---------- Previous post was at 16:39 ----------

BigBoss said:

You may do these simulation..
-Output Voltage vs. Temperature
-Output Voltage vs Process Variations and Mismatch-Monte Carlo Simulation
-PSRR vs Temperature for different Compansation Capacitor if it's available
-Output Noise
-Start-Up vs Temperature with Corners Check<---- Very important
-Latch-Up Test

Click to expand...

I want to simulate a thermal temperature sensor by using a PTAT circuit to generate the bias current, then connect the current to a ring oscillator to generate the frequency, then count the frequency.

IF ID1=ID2 AND R1=R2
RESULT VR1=VR2=VT*ln8
I think you should adjust the R2 to make the pmos and R2 work well.