Lab 9 TF EIM

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 [math]\displaystyle{ V_a = V_0 \cos(2 \pi \nu t) }[/math] where [math]\displaystyle{ V_0 = 0.1 }[/math] V and [math]\displaystyle{ \nu }[/math] = 1kHz. (20 pnts) 3.)Based on your observations using a oscilloscope, sketch the voltage at points A & B as a function of time. 4.)Do another sketch for[math]\displaystyle{ V_0 }[/math] = 1.0 V and another for 10.0 V. (20 pnts)

Differentiating Circuit with clipping

1. Construct the circuit below.
2. Select [math]\displaystyle{ R_1 }[/math] and [math]\displaystyle{ R_2 }[/math] such that the current from the +5V DC source is 1.0 mA and the DC voltage at [math]\displaystyle{ V_b }[/math] is 3 V.
3. Select a capacitor [math]\displaystyle{ (C_1) }[/math] to form a differentiating circuit for the pulse from the signal generator. Hint: [math]\displaystyle{ R_{12}C_1 \ll \tau }[/math].
4. plot [math]\displaystyle{ V_A }[/math] and [math]\displaystyle{ V_B }[/math] as a function of time using your scope observations. (20 pnts)
5. Now add the diode circuit from part 1 to prevent V_B from rising above +5 V.
6. plot [math]\displaystyle{ V_A }[/math] and [math]\displaystyle{ V_B }[/math] as a function of time with the diode circuit you added using your scope observations. (20 pnts)

Questions

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

Forest_Electronic_Instrumentation_and_Measurement