Pulse and Digital Circuits

8.3 CALCULATION OF THE VOLTAGES TO PLOT THE WAVEFORMS

To plot the waveforms at the two collectors and the two bases, the voltages in the circuit are to be calculated; when the multivibrator is in the stable state, when it is driven into the quasi-stable state and finally when it returns to the initial stable state. Consider the collector-coupled monostable multivibrator as shown in Fig. 8.1.

8.3.1 In the Stable State (t < 0)

Here, the assumption is that Q₂ is ON and in saturation while Q₁ is OFF. In this situation, the need is to verify whether Q₂ is really in saturation or not and whether Q₁ is in the OFF state.

To Verify that Q₂ is in Saturation. For this we need to calculate I_C2 and I_B2 and then verify whether I_B2 is significantly larger than ...