Contents
What is noise analysis?
Noise analysis is run in conjunction with an AC analysis, and calculates the output noise and equivalent input noise in a circuit. The output noise, at a specified output node, is the root mean square (RMS) sum of the noise generated by all the resistors and semiconductors in the circuit.
Do resistors add noise?
Audio noise generated by resistors results from the motion of electrons within the resistor, which creates an unwanted AC signal which gets superimposed over the primary DC signal. This type of noise falls into two categories: thermal noise and current noise.
What is voff in PSpice?
Voff is the DC offset value. It should be set to zero if you need a pure sinusoid. Vamplitude is the undamped amplitude of the sinusoid; i.e., the peak value measured from zero if there were no DC offset value. FREQ is the frequency in Hz of the sinusoid.
What is the use of .probe command in PSpice?
PRINT command allows results from DC, AC, noise, and transient analyses to be an output in the form of tables, referred to as print tables in the output file.
How to calculate the equivalent noise in PSpice?
To calculate the equivalent noise, PSpice A/D then divides the total output noise by the gain from the input source to the output net. This results in the amount of noise which, if injected at the input source into a noiseless circuit, would produce the total noise originally calculated for the output net.
Why is injecting random noise difficult in PSpice?
Injecting random noise into your circuit in PSpice has typically been a challenging task due to the additional PWL source needed and the creation and configuration of that source’s file for transient simulations.
How to calculate total noise at an output net?
To calculate the total noise at an output net, PSpice A/D computes the RMS sum of the noise propagated to the net by all noise-generating devices in the circuit. To calculate the equivalent noise, PSpice A/D then divides the total output noise by the gain from the input source to the output net.
How to configure a noise analysis simulation?
To configure a noise analysis simulation profile: 1. Create or edit an existing simulation profile. 2. Configure an AC Sweep simulation, as usual. 3. Click the Enabled box for Noise Analysis. 4. Type a value for the Output Voltage. Examples would be V(OUT), V(5) and similar statements.
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