A pulse modulation triangle current generator in virtuoso

Not quite sure what your aversion to VerilogA is, but if you want a current multiplier, you can use a pcccs (polynomial current-controlled current source) from analogLib (see "spectre -h pcccs" for details too). If you're multiplying two currents together then you'd specify the number of probes as 2, and then specify Poly Coeff 0 to 3 as being "0" and Poly Coeff 4 as "1". This will give you the output current as the product of the two input currents (you can adjust the other coefficients if you need it to not just be the product, or change the 1 to some other gain factor. You'd probably then just specify Probe 1 and Probe 2 as the voltage source (or iprobe) that you're measuring the current through (I think the Ports can be left blank).

I didn't try this out now to confirm, but the usage seems fairly straightforward (I've used pvcvsp many times to do a voltage multiplier).

Andrew.

Dear Johanny Saenz,

Johanny Saenz said:

I would like to know how can I can implement a triangule current generator modulated by a square pulse using instances (no VerilogA).

Sorry for the delay...but in addition to Andrew's suggestion, I thought I might put together a set of ideal components that might be appropriate. Basically, the circuit uses a capacitor and current source  to form a triangular voltage that I then convert to a current through a resistor of value rleakage. I periodically short out the capacitor with a second source to provide the modulation function. I use a controlled current source (current-controlled) with a gain of 100 to increase the amplitude of the modulated triangular current.  If this is anywhere close to what you are looking for, I've included a plot of the circuit (Figure 1) and an expanded view of some of its inputs and outputs (Figure 2). I attached a compressed file with additional plots, the spectre generated netlist (which contains all the parameter values I used), and the plot .grf files.

Anyway, it may not be what you are looking for, but your request piqued my interest...

Shawn

Figure 1

Figure 2

square_wave_modulated_triangular_current_source_waves_010621.zip

Thanks Shawn Logan. 

Thanks Shawn Logan. 

Dar Johnanny Saenz,

You are most welcome - but I just hope it was of some help or provided some insight into your problem!

Shawn