analogLib switch component not switching

While the images are extremely blurry, you can view them clearly by clicking on them.

Can you please post the input.scs to avoid me having to guess the parameters you're using?

Thanks,

Andrew.

Hi Andrew,

Sorry about that.

I've included the .scs files for both circuits.

Regards,

Matthew

(I'll paste them here in case they haven't uploaded properly; I dragged them into the editor and they "uploaded" but nothing has appeared.)

single_switch.scs

// Generated for: spectre
// Generated on: Oct 18 11:08:51 2018
// Design library name: scratchpad
// Design cell name: switch_test_mwe
// Design view name: schematic
simulator lang=spectre
global 0
parameters Vin_DC=0
include "$SPECTRE_MODEL_PATH/design_wrapper_rf.lib.scs" section=tt_pre
include "$SPECTRE_MODEL_PATH/soa_rf.scs"

// Library name: scratchpad
// Cell name: switch_test_mwe
// View name: schematic
W1 (0 0 net1 0) relay vt1=100.0m vt2=700.0m ropen=1 rclosed=1T
PORT0 (net1 0) port r=50 dc=Vin_DC type=sine edgetype=linear
simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \
    tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \
    digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \
    checklimitdest=psf
dcOp dc write="spectre.dc" maxiters=150 maxsteps=10000 annotate=status
dcOpInfo info what=oppoint where=rawfile
dc dc hysteresis=yes param=Vin_DC start=0 stop=0.8 oppoint=rawfile \
    maxiters=150 maxsteps=10000 annotate=status
modelParameter info what=models where=rawfile
element info what=inst where=rawfile
outputParameter info what=output where=rawfile
designParamVals info what=parameters where=rawfile
primitives info what=primitives where=rawfile
subckts info what=subckts where=rawfile
save W1:res
saveOptions options save=allpub

Inverter.scs

// Generated for: spectre
// Generated on: Oct 18 11:07:09 2018
// Design library name: scratchpad_class_d_stacked
// Design cell name: ideal_class_d_mwe
// Design view name: schematic
simulator lang=spectre
global 0
parameters Vin_DC=0
include "$SPECTRE_MODEL_PATH/design_wrapper_rf.lib.scs" section=tt_pre
include "$SPECTRE_MODEL_PATH/soa_rf.scs"

// Library name: scratchpad_class_d_stacked
// Cell name: ideal_class_d_mwe
// View name: schematic
V0 (net05 0) vsource dc=2.4 type=dc
W4 (M2_D net05 0 net02) relay vt1=100.0m vt2=700.0m ropen=1 rclosed=1T
W1 (0 M2_D net02 0) relay vt1=100m vt2=700.0m ropen=1T rclosed=1
PORT2 (net02 0) port r=50 dc=Vin_DC type=sine edgetype=linear
PORT1 (M2_D 0) port r=50 type=sine
simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \
    tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \
    digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \
    checklimitdest=psf
dcOp dc write="spectre.dc" maxiters=150 maxsteps=10000 annotate=status
dcOpInfo info what=oppoint where=rawfile
dc dc hysteresis=yes param=Vin_DC start=0 stop=0.8 oppoint=rawfile \
    maxiters=150 maxsteps=10000 annotate=status
modelParameter info what=models where=rawfile
element info what=inst where=rawfile
outputParameter info what=output where=rawfile
designParamVals info what=parameters where=rawfile
primitives info what=primitives where=rawfile
subckts info what=subckts where=rawfile
save W4:res W1:res
saveOptions options save=allpub

Hi Matthew,

I'm not entirely sure what you want here, but because the top switch (relay) has the inputs reversed, the voltage across the inputs is always negative (so that means you are sweeping it from 0 to -0.8V). If you swap the inputs to the top switch, then it does transition as you sweep Vin_DC from 0 0.8 (since you've switched the on and off resistances, I don't think you also want to invert the control voltage - if you do, you'll need to adjust the thresholds accordingly). This is what I get with W4 as:

W4 (M2_D net05 net02 0) relay vt1=100.0m vt2=700.0m ropen=1 rclosed=1T

By the way, I'm not sure why you are using two port components - it seems a bit bizarre having a port when you're driving a high impedance input... why not use a vsource for the Vin_DC input? After all, what is going to happen is that the voltage on the output of the port will be double what you have asked for, because you specify the voltage with the assumption that the load on the port is matched to the 50 ohm impedance, which it isn't here - the high impedance of the relay input means that you'll get double the voltage instead.

Regards,

Andrew.

Hi Andrew,

Thanks for the detailed reply.

I wasn't aware that the switch polarity was a factor but your reply has cleared it up for me.

>why not use a vsource for the Vin_DC input

You're right. I misinterpreted the documentation and should have just used a voltage source.

Thanks for pointing that out.

Regards,

Matthew

Hi Andrew,

Thanks for the detailed reply.

I wasn't aware that the switch polarity was a factor but your reply has cleared it up for me.

>why not use a vsource for the Vin_DC input

You're right. I misinterpreted the documentation and should have just used a voltage source.

Thanks for pointing that out.

Regards,

Matthew