Lab 1 LTSpice and Lab Report Preparation

Instructions:

1. Create a text file and code the following circuit in Spice (not in schematic). Use transient analysis to simulate the voltages at all voltage nodes. Build the circuit on a breadboard, test the voltages and the currents in the circuit.
Compare the simulation and measurement results to your calculation (use mesh current method to solve it). Put all your calculation, measurement, and simulation in a single table in your report.
** hint: '.tran 0 1 .01' means 'transient analysis, starting from time 0, ending at 1 second, step size is 0.01 second. This can be simplified as '.tran 1', which only shows the ending point at 1s.



2. Write the spice code for the following ciruit. Use transient analysis to display the input and the output signal in one plot, measure the time-delay and the amplitude attenuation of the output signal compare to the input. The following figure shows the time-delay. No need to calculate frequency response and no need to build the circuit on a breadboard.



3. DC sweep
In DC analysis, the X axis will be a DC voltage other than 'time' in transient analysis.
In the following schematic, the circuit ran a DC sweep for the input voltage from -2 V to 5 V. The X axis will be the 'sweep' of the DV values for Vin, the Y axis is the voltages in terms of the input.
Implement this circuit using Spice code, show your simulation results in your report.



4. AC analysis (AC sweep)
In Ac analysis, the X axis will be 'frequency', the Y axis will be the amplitude. This is very powerful. You can use this analysis to test the bandwidth of the circuit.
'.ac dec 1000 1 1MEG' means the axis units are in decades of increment, plot 100 points per decade, starting from 1 Hz to 1MEG Hz.
Implement this circuit in Spice code, and report your results.
** hint: the AC source here can be coded as: 'Vin Vin 0 ac 1'



5. DC pulses
Now let's use DC pulses as the input voltage source to drive a capacitor.
Use the Spice code to implement the following circuit and then measure the time-delay of the circuit. Compare it to your calculation.
**hint: the pulse function means PULSE (LowVoltage   HighVoltage   Delay   RisingTime   FallingTime   OnTime   Period). The reason that the period is a little longer than the 'On' time is the rising edge and the falling edge of the pulse are also taking time even though they are short. 



No need to build this cicuit on a breadboard.


-------------------Resistor Color Code






Follow the lab report guidelines to avoid losing points.