Revision as of 04:31, 17 February 2011

Lab 9: Diode Circuits

Clipping Circuit

1.) Construct the circuit shown below using a silicon diode.

2.) Use a sine wave generator to drive the circuit so $V_{in} = V_0 \cos(2 \pi \nu t)$ where $V_0 = 0.1$ V and $\nu$ = 1kHz. (20 pnts)

3.)Based on your observations using a oscilloscope, sketch the voltages $V_{in}$ and $V_{out}$ as a function of time.

4.)Do another sketch for $V_0$ = 1.0 V and another for 10.0 V. (20 pnts)

Select $R_1$ and $R_2$ such that the current from the +5V DC source is 1.0 mA and the DC voltage at $V_{out}$ is 3 V.
Select a capacitor $(C)$ to form a differentiating circuit for the pulse from the signal generator. Hint: $R_{12}C \ll \tau$ .
plot $V_{in}$ and $V_{out}$ as a function of time using your scope observations. (20 pnts)
Now add the diode circuit from part 1 to prevent $V_{out}$ from rising above +5 V.
plot $V_{in}$ and $V_{out}$ as a function of time with the diode circuit you added using your scope observations. (20 pnts)

Explain your results in parts 1 & 2 in terms of the diode turn-on voltage. (20 pnts)

@@ Line 18: / Line 18: @@
 #Select <math>R_1</math> and <math>R_2</math> such that the current from the +5V DC source is 1.0 mA and the DC voltage at <math>V_{out}</math> is 3 V.
 #Select a capacitor <math>(C)</math> to form a differentiating circuit for the pulse from the signal generator.  Hint: <math>R_{12}C \ll \tau</math>.
-#plot <math>V_A</math> and <math>V_B</math>  as a function of time using your scope observations. (20 pnts)
+#plot <math>V_{in}</math> and <math>V_{out}</math>  as a function of time using your scope observations. (20 pnts)
 # Now add the diode circuit from part 1 to prevent <math>V_{out}</math> from rising above +5 V.
 #plot <math>V_{in}</math> and <math>V_{out}</math>  as a function of time with the diode circuit you added using your scope observations. (20 pnts)