Lab 1: Review of Basic RC Circuits - EE 420L 

Author: Mario Verduzco

Email: Verdum1@unlv.nevada.edu

Date: 01/24/17

 

 

 

  

 

Pre-lab:

· Your lab reports will be drafted using html and placed on CMOSedu.

· Prior to the first day of lab, but no earlier than one week before the lab starts, request a CMOSedu account, using your UNLV email address, from Dr. Baker (rjacobbaker@gmail.com).

· Review the material seen here covering editing webpages (do this before the first lab).

· Read the entire write-up seen below before coming to lab

 

Lab description:

           The objective of this lab is to calculate, simulate, and measure the magnitude and phase of the frequency responses of a variety of RC circuits.

 

Lab requirements:

· Circuit schematic showing values and simulation parameters (snip the image from LTspice).

· Hand calculations to detail the circuit's operation.

· Simulation results using LTspice verifying hand calculations.

· Scope wave forms verifying simulation results and hand calculations.

· Comments on any differences or further potential testing that may be useful (don't just give the results, discuss them).

 

Experimental Results:

Experiment #1: An RC circuit

Experiment #1: Hand calculations

 

Experiment #1: Simulations

 

Experiment #1: Measurements

 

Fig 1.1– LTspice .tran simulation

Fig 1.2– Magnitude of Vout on oscilloscope

Fig 1.3– Phase shift on oscilloscope

Experiment #1: Results

Experiment #1: AC analysis

Fig 1.4– Frequency Response simulation

Table 1.2– Magnitude and phase measurements

Table 1.1– Calculated results compared to simulated and measured results

Fig 1.5– Magnitude response

Fig 1.6– Phase response

Experiment #2: Another RC circuit

Experiment #2: Hand calculations

Experiment #2: Simulations

Fig 1.7– LtTSpice .tran simulation

Experiment #2: Measurements

Fig 1.8– Magnitude of Vout on oscilloscope

Fig 1.9– Phase shift on oscilloscope

Experiment #2: Results

Table 1.3– Calculated results compared to simulated and measured results

Experiment #3: RC circuit Step response

Experiment #3: Hand calculations

Experiment #3: Simulation

Experiment #3: Measurements

Fig 1.10– LtTSpice .tran simulation

Experiment #3: Results

Fig 1.8– Vout step response on oscilloscope

         The results from the hand calculations, simulations, and experiment are all very close to each other.

         In both the simulation and experiment after 5 time constants the capacitor was fully charged.  However with the pulse width of 4ms the capacitor did not fully charge.

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           The results for this circuit were further apart than the previous experiment. Still within ±10% the circuit did what it was calculated to do.