Lab 9 TF EIM

Lab 9: Diode Circuits

Clipping Circuit

1. Construct the circuit shown below.
2. Use a 1 kHz sine wave generator to drive the circuit so [math]V_a = V_0 cos(2 \pi \nu t)[/math] where [math]V_0 = 0.1[/math] V and [math] \nu[/math] = 1kHz.
3. Based on your observations using a scope, sketch the voltage at points A & B as a function of time.
4. Do another sketch for[math] V_0[/math] = 1.0 V and another for 10.0 V.

Differentiating Circuit with clipping

1. Construct the circuit below.
2. 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_b[/math] is 3 V.
3. Select a capacitor [math](C_1)[/math] to form a differentiating circuit for the pulse from the signal generator. Hint: [math]R_{12}C_1 \ll \tau[/math].
4. plot [math]V_A[/math] and [math]V_B[/math] as a function of time using your scope observations.
5. Now add the diode circuit from part 1 to prevent V_B from rising above +5 V.
6. plot [math]V_A[/math] and [math]V_B[/math] as a function of time with the diode circuit you added using your scope observations.

Questions

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

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