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# Node Capacitance Spectre

9 Threads found on edaboard.com: Node Capacitance Spectre

## how to print node-to-node capacitance?

I'm trying to find a way in spectre to calculate the capacitance between every two terminals of a transistor (I hope it exists). In spectre users' Guide, info could be used to print node-to-node capacitance. (...)

## Measuring Node Capacitance

i think you can get the summary of parasitic capacitance at each node after doing layout parasitic extraction

## Regarding Node capacitance in spectre

Hi Connect port with large impedance (50MOhm for ex) to interesting node. Start SP at interesting freq. Then Cnode=imag(Y11)/2/pi/freq You can connect port via large capacitance also. Regards.

## how to print node capacitor in spectre?

we can use .print cap(node) to plot capacitor curves in hspice. But how do we do that in spectre? I found there was a captab option in transient analysis. But it seems that it only calculate a capacitors at one point... Is there any idea?

## how to get the node capacitance and resistance using spectre

First, you should using verification tool diva, dracula or calibre get the extracted file, and annoded the parisitic parameter. I know the cadence cdsdoc include some paper refer to it. you can read it

## How to find out the total node capacitance during DC simulation using Spectre?

hi, is there a straight forward way in spectre to find out the total node cpacitance on a certain node during dc simulation ?

## ploting capacitance vs node voltage

hey guys i want to plot capacitance on x axis through parameter sweep and voltage at a node on y axis.when i do performance analysis then i don't get voltage as an allowed variable.and without performance analysis i dont get capacitance on x axis. how can i do it? pls help soon if possible. thanx in advance a lot.

## Difference in Algorithms used

spectre works on Transient Imbalance (change in the node voltages)algorithms while SPICE works on capacitance charging and discharging algorithms. The methods are more or less similar in both.

## One question of hspice/spectre simulation?

In HSPICE you can define the capacitance of a capacitor with an equation. For example: Csensor node1 node2 c='5p*v(controlvoltage)' CTYPE=1 This will make your capacitor depend on the voltage at the node "controlvoltage". If this voltage is defined to be 1V from 0s to 500us, 2V from 500us to 1ms and back to 1V at 1ms, (...)