PSUD2 and CCS

[tim614]

HI,

i want to confirm something on the PSUD2.
when using the PSUD2, do i put in a CCS for each stage to get acurate reading?

[DF96]

If your design will have a CCS at each stage, yes. If it has a staged amplifer load then an appropriate resistor might be better. You will have to decide whether your circuit behaves more like a CCS or more like a resistor when the supply voltage changes.

[tim614]

thanks DF96!

i am working on a set 2a3 with ccs on the driver stage but not for the 2a3. so what is a resistence loade for the 2a3?

[DF96]

It depends on what working point you have chosen. As a rough guide you could just use Ohm's Law on the quiescent anode voltage and current to get the effective resistance.

[tim614]

thanks!
but it seem i cant put a resistive load on the 2a3, only CCS when using the PSUD2.
anyway, i think just using the CCS on both is close enough for me. i just wanted to confirm what i was doing is correct.

[DF96]

PSUD2 can add a resistive load. Try a right-click at the appropriate part of the circuit.

[tim614]

i can only change from resistive to CCS or from CCS to resistive on "load#2", but not on load#1.
C_L_C- load#1_L_C-load#2

[tim614]

when right clik on Load #1, it only give me option for either for stepload or select type of filter.

[DF96]

OK, I just had a quick try myself. It looks like it won't let you add a resistive load partway along. A pity, as that will model some circuits.

You could email Duncan and ask him to consider it for a future version.