How to do trans analysis for these exp?

[muffassir]

Hi all,

In my circuit for multiplier i have 2 inputs Ix and Iw
For DC i have used these expressions.

Ix+=(1+x)/250n
Ix-=(1-y)/250n

Iw+=(1+w)/250n
Iw-=(1-w)/250n

Now i want to do the transient analysis :::As given in IEEE paper tht i am using
For 100Hz with peak value-40nA(x=0.16)
For 4KHz with peak value=160nA(w=0.64)



I have tried it by using isin :
Ix+ = AC magnitude=1 , Amplitude=40n, Freq=100
Ix- = AC magnitude=1 , Amplitude=-40n, Freq=100
Iw+ = AC magnitude=1 , Amplitude=160n, Freq=4K
Iw- = AC magnitude=1 , Amplitude=-160n, Freq=4K

Th output tht i am getting should be modulated wave for these two frequencies..But it is as shown below.




What i expect is




Please help me out how to do that??
Thanks in advance.

 

[erikl]

Hi muffassir,

I imagine what you got is the correct result for a function like y = sin ωt * 4sin 40ωt

What i expect is

If you need a full-through modulation, the modulation (low-frequency) signal must be considerably stronger, see here: View attachment sin-gen.pdf