Parallel Clippers : Part3
Note : The negative clipping with basic parallel clipper can be achieved by reversing the direction of diode.
When Vin is positive then the diode is reversed biased and acts as an open circuit. Thus the output voltage Vo is same as Vin for R1 < < RL. Hence the positive half cycle of Vin gets reproduced at the output. This is shown in the Fig. 1.
 |
| Fig. 1 Basic parallel clipper |
 |
| Fig. 2 Basic parallel clipper ( Negative clipping) |
The magnitude of the output voltage is,
Consider the negative half cycle of Vin. As Vin decreases below zero and becomes -0.7 V, the diode becomes forward biased and acts conducting. As long as Vin < -0.7 V, the diode remains ON and drop across it is cut-in voltage Vγ = 0.7 V, with polarities as shown in the Fig. 2(a).
Note : As diode and RL are in parallel, the output voltage is equal to the drop across diode i.e. 0.7 V in opposite direction.
... Vo = -0.7 V for Vin < -0.7V
Thus the entire negative half cycle gets clipped off, as shown in the Fig. 2(b).
 |
| Fig.3 Basic parallel clipper ( Negative clipping) |
The overall input-output waveforms can be shown as in the Fig. 3. The
Fig.4(a) shows the waveforms with piecewise model of diode while the
Fig. 4(b) shows the waveforms with an ideal diode approximation with Vγ = 0 V.
 |
| Fig. 4 |
Transfer characteristics :
The transfer characteristics equations are,
The transfer characteristics are shown in the Fig. 5.
 |
| Fig. 5 Transfer characteristics |
This comment has been removed by the author.
ReplyDeleteLooking for terminal crimping machine ? Then we are the best for you, who suit your expectations. We have huge experience on this field. We are 100% dedicated to find you terminal crimping machine.
ReplyDeleteWe are dedicated to manufacturing and sales of a wide range of terminal crimping machines including pneumatic crimping tool for crimp clamps.
You can find here your best one. If you want to know more, Please check out Cheers Electronic Technical Co., LTD: https://www.terminal-crimping.com/