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Old 8th March 2013, 08:02 PM   #1
tim614 is offline tim614  United States
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Default PSUD2 and CCS

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?
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Old 8th March 2013, 08:13 PM   #2
DF96 is offline DF96  England
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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.
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Old 8th March 2013, 09:01 PM   #3
tim614 is offline tim614  United States
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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?
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Old 9th March 2013, 09:50 AM   #4
DF96 is offline DF96  England
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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.
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Old 9th March 2013, 12:47 PM   #5
tim614 is offline tim614  United States
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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.
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Old 9th March 2013, 02:42 PM   #6
DF96 is offline DF96  England
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PSUD2 can add a resistive load. Try a right-click at the appropriate part of the circuit.
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Old 9th March 2013, 03:01 PM   #7
tim614 is offline tim614  United States
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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
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Old 9th March 2013, 03:04 PM   #8
tim614 is offline tim614  United States
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when right clik on Load #1, it only give me option for either for stepload or select type of filter.
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Old 9th March 2013, 03:10 PM   #9
DF96 is offline DF96  England
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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.
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