hi
i m designing 4 quadrent analog multiplier. there r four ip terminal in my strecture.
i m giving V1+v1, V1-v1, V2+v2, V2-v2, signal at the input terninals, where V is D.C. bias and v is analog signal. i m gettin correct out put.but i dont know how can i do a.c. analisis of the circuit. i mean apply same ac signal at all the terminal with some dc bias or other?
You can't apply same AC signal to all the input ports, or else you will get wrong simulation results. If it is quadrature input, that is vin/0°, vin/90°, vin/180°, and vin/270°, you can use four AC sources with differenct initial phase. Or you can use one AC source and a 90° splitter then two balun to ganerate the for input signals.