Ocean Script for differential amplifier

pancho_hideboo · Jun 21, 2017

Surely understand meaning of #8.
First of all, Spectre does not launch at all due to syntax error of netlist.
Surely see and understand logfile of Spectre.

And even if Spectre does run, post processing will fail since you don't define I, W, L at all.

And your "input.scs" does not include "paramset statement".

Narakiran said:
netlist header

You can not understand Cadence ADE at all.
Surely learn very basic operation.

I recommend you to attend kindergarten level training of Cadence ADE.

Narakiran said:
I have to write code for Nelder-Mead method in Ocean.

https://en.wikipedia.org/wiki/Nelder–Mead_method

Use ADE-GXL or OCEAN-XL.

The following fragments are case when we don't use Spectre's "paramset" ability.

Code:

I_list = list(150u, 155u, 170u, 180u)
W_list = list(0.5u, 0.8u, 0.9u, 1u)
L_list = list(10u, 15u, 17u, 22u)

n = length(I_list)
for(i, 0, n-1
  I = nth(i, I_list)
  W = nth(i, W_list)
  L = nth(i, L_list)

  desVar("I", I)
  desVar("W", W)
  desVar("L", L)

); for

Narakiran · Jun 22, 2017

I_list = list(150u, 155u, 170u, 180u)
W_list = list(0.5u, 0.8u, 0.9u, 1u)
L_list = list(10u, 15u, 17u, 22u)

n = length(I_list)
for(i, 0, n-1
I = nth(i, I_list)
W = nth(i, W_list)
L = nth(i, L_list)

desVar("I", I)
desVar("W", W)
desVar("L", L)

); for

I have used this but still the code is not working.
Please can you check it once.

The code is
-----------------------------------------------
[CODE}

prt=outfile("/home/15vl21f/anil.csv" "w")
simulator( 'spectre )
design( "/home/15vl21f/simulation/diff_amp/spectre/schematic/netlist/netlist")
resultsDir( "/home/15vl21f/simulation/diff_amp/spectre/schematic" )
openResults( "/home/15vl21f/simulation/diff_amp/spectre/schematic" )
modelFile(
'("/opt/cad/cad/FOUNDRY/analog/180nm/models/spectre/gpdk.scs" "stat")
)

I_list = list(150u, 155u, 170u, 180u)
W_list = list(0.5u, 0.8u, 0.9u, 1u)
L_list = list(10u, 15u, 17u, 22u)

analysis('ac ?start "10" ?stop "100G" )
analysis('dc ?saveOppoint t )

fprintf(prt "I, W, L, Gain, Bandwidth, overdrive, tail_current\n")

n = length(I_list)
for(i, 0, n-1
I = nth(i, I_list)
W = nth(i, W_list)
L = nth(i, L_list)

)

desVar("I" I)
desVar("W" W)
desVar("L" L)

envOption(
'analysisOrder list("dc" "ac")
)
temp( 27 )
run()

x = ymax(db20(VF("/vout")))
y = bandwidth(VF("/vout") 3 "low")
vth = pv("NM0" "vth" ?result "dcOpInfo")
vgs = pv("NM0" "vgs" ?result "dcOpInfo")
overdrive = vgs - vth
tail_current = 2 * pv("NM0" "id" ?result "dcOpInfo")
Gain = x
Bandwidth = y
fprintf(prt "%d, %f m, %f m,%f dB, %f Hz, %f V, %f A\n", I, W, L, x, y, overdrive, tail_current)

)
)
)
)
close(prt);[CODE}

pancho_hideboo · Jun 22, 2017

Simply location of right parensis ")" is wrong.

Narakiran · Jun 22, 2017

*Error* db20: can't handle db20(nil)

*Error* _ymaxMethod: can't handle _ymaxMethod(nil)

*Error* _bandwidthMethod: can't handle _bandwidthMethod(nil 3 "low" nil)
*Error* difference: can't handle (nil - nil)
*Error* load: error while loading file - "anil.ocn" at line 43

Error is coming like this. I think the list of input values are not allocating to desVar.

pancho_hideboo · Jun 22, 2017

Surely understand my post of #23.

Narakiran · Jun 22, 2017

Yes. I have changed it.

prt=outfile("/home/15vl21f/anil.csv" "w")
simulator( 'spectre )
design( "/home/15vl21f/simulation/diff_amp/spectre/schematic/netlist/netlist")
resultsDir( "/home/15vl21f/simulation/diff_amp/spectre/schematic" )
openResults( "/home/15vl21f/simulation/diff_amp/spectre/schematic" )
modelFile(
'("/opt/cad/cad/FOUNDRY/analog/180nm/models/spectre/gpdk.scs" "stat")
)

I_list = list(150u, 155u, 170u, 180u)
W_list = list(0.5u, 0.8u, 0.9u, 1u)
L_list = list(10u, 15u, 17u, 22u)

analysis('ac ?start "10" ?stop "100G" )
analysis('dc ?saveOppoint t )

fprintf(prt "I, W, L, Gain, Bandwidth, overdrive, tail_current\n")

n = length(I_list)
for(i, 0, n-1
I = nth(i, I_list)
W = nth(i, W_list)
L = nth(i, L_list)

desVar("I" I)
desVar("W" W)
desVar("L" L)

)
envOption(
'analysisOrder list("dc" "ac")
)
temp( 27 )
run()

x = ymax(db20(VF("/vout")))
y = bandwidth(VF("/vout") 3 "low")
vth = pv("NM0" "vth" ?result "dcOpInfo")
vgs = pv("NM0" "vgs" ?result "dcOpInfo")
overdrive = vgs - vth
tail_current = 2 * pv("NM0" "id" ?result "dcOpInfo")
Gain = x
Bandwidth = y
fprintf(prt "%d, %f m, %f m,%f dB, %f Hz, %f V, %f A\n", I, W, L, x, y, overdrive, tail_current)

)
)
)
)
close(prt);[CODE}

Narakiran · Jun 22, 2017

Code:

prt=outfile("/home/15vl21f/anil.csv" "w")
simulator( 'spectre )
design( "/home/15vl21f/simulation/diff_amp/spectre/schematic/netlist/netlist")
resultsDir( "/home/15vl21f/simulation/diff_amp/spectre/schematic" )
openResults( "/home/15vl21f/simulation/diff_amp/spectre/schematic" )
modelFile(
'("/opt/cad/cad/FOUNDRY/analog/180nm/models/spectre/gpdk.scs" "stat")
)

I_list = list(150u, 155u, 170u, 180u)
W_list = list(0.5u, 0.8u, 0.9u, 1u)
L_list = list(10u, 15u, 17u, 22u)

analysis('ac ?start "10" ?stop "100G" )
analysis('dc ?saveOppoint t )

fprintf(prt "I, W, L, Gain, Bandwidth, overdrive, tail_current\n")

n = length(I_list)
for(i, 0, n-1
I = nth(i, I_list)
W = nth(i, W_list)
L = nth(i, L_list)

desVar("I" I)
desVar("W" W)
desVar("L" L)

)
envOption(
'analysisOrder list("dc" "ac")
)
temp( 27 )
run()


x = ymax(db20(VF("/vout")))
y = bandwidth(VF("/vout") 3 "low")
vth = pv("NM0" "vth" ?result "dcOpInfo")
vgs = pv("NM0" "vgs" ?result "dcOpInfo")
overdrive = vgs - vth
tail_current = 2 * pv("NM0" "id" ?result "dcOpInfo")
Gain = x
Bandwidth = y
fprintf(prt "%d, %f m, %f m,%f dB, %f Hz, %f V, %f A\n", I, W, L, x, y, overdrive, tail_current)

close(prt);[CODE} [/QUOTE]

I don't know what else to do? Can you help me in this please.

pancho_hideboo · Jun 22, 2017

Surely consider loop structure of script.

Your issues are too trivial and low level,
discuss with students who are same level as you.

Narakiran · Jun 27, 2017

Narakiran said:
I'm a student. I'm working on Cadence - Virtuoso. I have to write Ocean script for following Algorithm. I'm completely new to Ocean. So please help me to write code for the algorithm View attachment 139526

The file is attached.

Please help me to write Ocean Script for the algorithm which is attached.
Thank you.

Ocean Script for differential amplifier

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