Low Pass And High Pass Filter Circuits (Page 3 of 4) in pdf

Low Pass And High Pass Filter Circuits Page 3

Procedure: Part 3: Using Electronic Workbench to Simulate a Filter Circuit

Draw the low pass circuit in

EWB as shown.

Use Electronic Workbench to measure the voltage gain and phase angle values for

the RC low pass filter circuit. Click on Circuit, Schematic Options and then Show

Nodes and OK. Click on the Analysis menu item and select AC Frequency. Enter

100 Hz for the Start frequency and 1000 kHz for the End frequency. Select

Sweep Type as Decade, Number of Points 200 and Vertical Scale as Decibel.

Be sure that the output node number is added to the Nodes for Analysis box.

Click on Simulate.

Examine the graphs produced and compare them to your

graphs prepared from the measured results.

Maximize the screen for the graphs and click your mouse on the upper graph

(voltage gain vs frequency) and then click on the Toggle Grid icon and then the

Toggle Cursors icon at the top of the screen.

Use the right hand cursor to

measure the voltage gain of the circuit in dB. Drag the right-hand cursor onto 1

kHz. Read the value of voltage Gain (in dB) from the value for y2 in the cursor

data display table. Record this value in the table below. Repeat this measurement

at the frequencies shown in the table below (i.e. 2kHz, 5kHz etc).

Find the corner frequency by moving the right-hand cursor until the y2 display

shows as close to -3.01 dB as possible. Record the value of f

as the value shown

for x2.

= ______________

Repeat this procedure on the bottom graph (phase angle vs frequency) and record

the set of measurements for phase angle in the table below. Compare these results

to what you obtained in Part 1.

Low Pass And High Pass Filter Circuits Page 3