noise analysis in cadence

[preethi19]

Hi i am trying to do noise analysis for a four-quadrant multiplier with two inputs i1 and i2. The output is obtained by driving it through load resistor of 1K. Now when i do noise analysis both the input and output noise are the same with no change. The steps i did were
Chose noise in analysis and set the frequency range. For input noise i chose the option "current" and chose one of the inputs (i2). For output noise i only had the option to choose between "probe" and "voltage". So i chose probe and selected the resistor. The input and output noise is same in waveform except the y axis of input noise is in nano scale while the output noise is of the form pA/sqrt(Hz). But when i choose i1 as input noise i can notice some change in waveform between input and output noise. Also in "edit object properties" i have for the resistor component to choose "generate noise" yes or no. I selected the option no. Is my procedure right. Can anyone please help.

The above is for noise vs frequency. Can anyone please tell me how i can plot output noise vs (one of the input current). Plssss help!!!

 

[pancho_hideboo]

There is no tool whose name is cadence.
Even if you use Cadence ADE, we can use various vendor's simulators such as Synopsys HSPICE, Mentor Eldo, Keysight ADS, Keysight GoldenGate, Cadence Spectre, etc.

Always describe correct tool's name and vendor's name which you use as tool or simulator.

Hi i am trying to do noise analysis for a four-quadrant multiplier with two inputs i1 and i2.
The output is obtained by driving it through load resistor of 1K.
............................
Now when i do noise analysis both the input and output noise are the same with no change.

Show me schematic and netlist fragment regarding signal source statement and analysis statement.

Also in "edit object properties" i have for the resistor component to choose "generate noise" yes or no.
I selected the option no.
Is my procedure right. Can anyone please help.

It depends on your purpose.
If you want to include noise from load resistor, you have to set "isnoisy=yes".

The above is for noise vs frequency.
Can anyone please tell me how i can plot output noise vs (one of the input current).

I assume you use Cadence ADE as post processing enviornment.
Invoke parametric noise analysis with sweeping input current value.
Then use "value()" function in Cadence OCEAN(=Skill) to specify necessary frequency..