Simulation of Cascaded Resistors and Voltage Drops

- November 5, 2024 at 4:04 pm
  
  msyf
  Subscriber
  
  I am attempting a DC IR analysis using Ansys SIwave where I have multiple stages of resistors. Therefore, I have created a simple PCB for evaluation purposes. In the circuit, I have a voltage source, multiple resistors in series until it reaches an LED. For simplicity terms, I have created a dumbed down version of the setup.
  I have set the voltage source on R1 and the LED as a current source.
  I am not able to simulate successfully the correct voltage levels across different the resistors.
  I am attaching the set configurations and the obtained results.
  Can someone kindly guide me on the proper way to set this up?
- November 7, 2024 at 11:15 am
  
  Mrinmoy Bharadwaj
  Ansys Employee
  
  Kindly correct the set-up for correct results.
  1. Your voltage source must be connected between VCC and GND (not NetR1_2). Both voltage and current source should have the same reference net.
  2. Select the "negative" for the voltage source under "Node to ground".
  - November 7, 2024 at 1:22 pm
    
    matthew.sultana
    Subscriber
    
    Thanks for your reply.