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Simulators >> Circuit Simulators >> pz simulation of differential OTA
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Message started by lianming1 on Jun 20^th, 2005, 6:59am

Title: pz simulation of differential OTA
Post by lianming1 on Jun 20^th, 2005, 6:59am

Hi, I am simulating differential cascode OTA with Hspice. I meet one problem when I do .pz simulation. and
hspice give me following message in the list file:

* project opa_cascode_test_3
****** pole/zero analysis tnom= 25.000 temp= 25.000
******

input = 0:vin+ output = v(out+

input = 0:vin+ output = v(out+

**warning** pole analysis stopped - iterno .gt. 100
xreal= 4.52848E-14 ximag= -1.11504E-12
***** no poles found ***** coeffd = -3.013e-01
**warning** zero analysis stopped - iterno .gt. 100
xreal= 4.12406E-14 ximag= -1.30545E-12
***** no zeros found ***** coeffn = -8.185e+03

***** constant factor = -8.185e+03 *****
csdfcntl: error in cio Write funtion
csdfcntl: error in cio Write funtion

Can you help me? thanks a lot!

Best regards!

lianming1