orCAD PSpice model for micro and sensor - Page 1
Forum section: electronics / beginners

author: Alex9
author_rank: Contributor
timestamp: October 01, 2013, 06:03:10 am
content: How to create the equivalent model of this diagram in the program?

author: Codemonkey
author_rank: Regular Contributor
timestamp: October 01, 2013, 06:18:19 am
content: You can't. You can model bits of it using voltage sources and resistors etc, but you won't find a complete model for either the sensor or especially the micro. You'll have to provide way more info though if you expect anyone to help you. What are you trying to achieve by modeling it ? Is this homework by any chance ?

author: AlfBaz
author_rank: Super Contributor
timestamp: October 01, 2013, 03:26:24 pm
content: I think you need to read up on what spice simulatesHere's a starthttp://en.wikipedia.org/wiki/SPICE

author: jorisbeurden
author_rank: Newbie
timestamp: October 01, 2013, 03:31:43 pm
content: Have you thought about you want to model exactly? Do you want to know transient or steady state behavior and is a SPICE model even needed for your purpose?

author: Alex9
author_rank: Contributor
timestamp: October 02, 2013, 10:55:48 am
content: I didn't find model of these components on sites of vendors. I drew the equivalent circuit, but it measures the same tension. How to make a source controlled? The source replaces the sensor.

author: Alex9
author_rank: Contributor
timestamp: October 02, 2013, 11:06:46 am
content: I need to execute the following analysis types in this program:Bias Point Delay, DC Sweep,AC Sweep,Transient,Fourier Analysis,Parametric,Monte-Carlo,Sensitivity,Transfer Function,Worst-Case.It is necessary to clarify how my diagram works. Thank you.

author: Bored@Work
author_rank: Super Contributor
timestamp: October 02, 2013, 12:35:44 pm
content: Quote from: Alex9 on October 02, 2013, 11:06:46 amYou don't know what you are talking about. Your options are1) You start familiarizing yourself with the tools and theory, so you know what you are talking about.2) You continue to randomly throw buzzwords around, without knowing what they are about.It is time that you make a decision. Invest your own time, or continue looking stupid.

author: Alex9
author_rank: Contributor
timestamp: October 03, 2013, 06:36:10 pm
content: As the thermal sensor - a low-frequency component, me recommended to remove from the capacity and resistance scheme. At me such scheme turned out. I am strongly limited in performance terms. Whether this scheme is correct?

author: jorisbeurden
author_rank: Newbie
timestamp: October 04, 2013, 09:49:12 am
content: That last schematic puzzles me, I think you need to start learning a bit more about the basics as the last schematic can't do anything. It's a good idea to ask someone near to you to help you somewhat.

author: AlfBaz
author_rank: Super Contributor
timestamp: October 04, 2013, 02:34:35 pm
content: Quote from: Alex9 on October 02, 2013, 10:55:48 amIf you just want to use arbitrary voltages over time read up on and use the piecewise linear voltage source(PWL)QuoteA simple model of the original circuit looks like the one attached. Vout and Rs represent the temperature sensor. Rin and Cin represent the ADC (at least just the sample and hold front end)Rs is the sensors output impedence, Rin is usually the mux switches' resistance and Cin is the sampling capacitor.When a sample is taken of the input the ADC pin is connected momentarily to the sampling capacitor. It charges up to the input voltage and then disconnected from the input. The ADC now converts the voltage stored in this cap to a binary valueIf the output impedance of the sensor (Rs) is to high then you run the risk of not having enough time to charge the sampling capacitor to the proper voltage before the mux switch opens