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Finding charging through a capacitor in Cadence spectre

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analog_chip

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Hi,

I want to find the charging current of a capacitor connected to a push pull amplifier when the the input is sweeped from 0 to vdd.

I am using spectre in cadence where in ADE I am using DC simulation to sweep my DC I/P voltage along with Ac simulation so that I can see the current in the capacitor. I have added an AC source in series with DC source and I sweeped the frequency arbitarrily form 1KHz to 10KHz.

Unfortunately the current through capacitor is always 0. How can I see the current?

Thanks
 

You might get help if you'd want to post your test bench schematic.
 

Hi BOE,

The circuit and the i v/s vin curves i am trying to simulate is attached. It needs to be mentioned that I1 is not equal I2 except at vin=Vvg. I want to fing Vvg as shown in picture where I1=I2.


I am always getting I1=I2 and I=0 in my simulations. How can I get these curves?

The circuit and curve is here

27_1319398886.jpg


Thanks
 

analog_chip said:
I am always getting I1=I2 and I=0 in my simulations.
Click to expand...
Of course. In your inverter circuit this obviously is necessary. You can't get the required curves with this circuit.

analog_chip said:
How can I get these curves?
Click to expand...
Disconnect the drains of Tp and Tn, then connect Tp's drain to GND (0), and Tn's drain to VDD . Measure their drain currents I1 & I2.
 

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