Chap 3. Simple Diode I-V Representation. V ON = 0.7v. Ideal. R Leak. R ON =ohms. Diode Symbols and Ckt Representation. Diode SPICE parameters. Simple Diode Rectifer. R Leak. R on =RS =10 ohms. Limiters/Clippers. R Leak. 10V. -8V. Limiters/Clippers Con’t Zeners. V +V Z. V Z.
VON = 0.7v
Ron =RS =10 ohms
Vo = RDiode Vin/(RDiode+R)
|RS + jXCB | <
|20xRL + JXCL|
Initially Qp is zero,all If goes to dQp/dt
In steady state ,
Charge Storage: The process of excess charge removal to undo the charge just built up.
Until the removal of Qp is complete, diode will continue to remain on with Vd 0.7V.
Cuttoff: During this transient no substantial amount of excess holes is built up.
id = dQj/dt.
The applied current goes to charge Cj .A simple first order circuit.
Charging of Cj is confirmed by the spike in the current.
Neagtive Ir should confirm
Charge at time t is given by
All of Qp has been swept , and the diode is back at the edge of conduction.
Retraces its initial turn on transient , but in reverse direction.
Id is negative , but is still governed by