How to generate a Bode plot in PSpice

An important characteristic of an analog circuitry is the behavior of the transfer function as the frequency of a source varies. The graphical representation of this is called the Bode plot. It consists of a gain and a phase response as a function of frequency. It is extremely helpful to study the stability of a control system.

PSpice offers a handy solution for Bode plot phase and gain response.

It has a dedicated option of DB and PHASE type markers to get the traces in Probe.

To plot a phase and gain response, run an AC sweep profile and use the following markers:

• dB Magnitude of Voltage
• dB Magnitude of Current
• Phase of Voltage
• Phase of Current

An AC sweep analysis will perform the frequency variation.    

PSpice has an option to further make this process simpler (a single-click operation) with the help of Plot Window Templates.

The Description field further explains about each Bode Plot option.

The user needs to select a “Bode Plot” from the list of Plot Window Templates and a marker gets attached to the mouse cursor, ready to be placed on the desired node. Once this is placed on a node, it will generate a Bode plot for the voltage or current of the given node.

Team DesignTech

Cadence Design Systems