How can I set a voltage source based on a measured voltage?
For example, take 2 simple loops. I'd like to set V3 to 5 times V2 Loop 1: V1(10 volts) to V2(0 volts) to R1(100ohm) to ground. Loop 2: V3(V2 * 5) to R2(100 ohm) to ground.
V3 N001 0 V2 5
LTspice is reading "V3 N001 0 V2 5" as "V2" is a node. Since you then have too many nodes LTspice is probably giving you an error message.
I think it's the same in LTspice as in PSpice...
V3 N001 0 {V(N003)*5}
I don't know if...
V3 N001 0 {V2*5}
will work in LTspice or not. PSpice would require a .PARAM statement.
...Jim Thompson
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"chapmjw" schrieb im Newsbeitrag news: snipped-for-privacy@m58g2000cwm.googlegroups.com...
Hell Jim,
There are voltage controlled voltage and current sources and current controlled voltage and current sources. (VCVS=E, VCCS=G, CCVS=H, CCCS=F)
You can solve your problem with a E-source. It has two inputs for the control voltage and two output nodes. You have to set the gain to 5 in your case. These sources are available for schematic drawings of course.
Syntax: Exxx n+ n- nc+ nc- The final netlist will look like the following. E1 N001 0 N003 N002 5
All this is pure SPICE. I recommend to read about the devices of SPICE or at least the help of LTspice.
Best regards, Helmut
I'm not sure what V2 is there for but lose it and label the 10V source to resistor wire as (say) Fred. That fred node can be referred to elsewhere using the very handy "bv" component.
V1 Fred 0 10 R1 Fred 0 100 R2 N001 0 100 B1 N001 0 V=v(fred) * 5 .tran 1 .backanno .end
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My nodes number up slightly different, so clarify by the diagram ...
Version 4 SHEET 1 480 164 WIRE 48 -304 -96 -304 WIRE -96 -208 -96 -304 WIRE 48 -160 48 -304 WIRE 336 -144 176 -144 WIRE 336 -96 336 -144 WIRE 176 -80 176 -144 WIRE -96 -48 -96 -208 WIRE 48 32 48 -80 WIRE 176 32 176 0 WIRE 336 32 336 -16 FLAG -96 32 0 FLAG 48 32 0 FLAG 176 32 0 FLAG 336 32 0 FLAG -96 -208 Fred SYMBOL voltage -96 -64 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 10 SYMBOL res 32 -176 R0 SYMATTR InstName R1 SYMATTR Value 100 SYMBOL res 320 -112 R0 SYMATTR InstName R2 SYMATTR Value 100 SYMBOL bv 176 -96 R0 SYMATTR InstName B1 SYMATTR Value V=v(fred) * 5 TEXT -210 44 Left 0 !.tran 1
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