14 - PN transient - EECS 320 P-N Diode: Transient Response...

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EECS 320 P-N Diode: Transient Response J. Phillips EECS 320 Transient Response Large Signal Small Signal Switching applications Fwd Rev bias Charge storage and extraction Small variation near operating bias Equivalent circuit Frequency response C j r 0 C dif C D I D R S SPICE useful for transient analysis Equivalent circuit useful for small-signal analysis
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J. Phillips EECS 320 Small Signal AC Response Determine equivalent RC circuit to represent diode R S = series resistance of contacts and quasi-neutral bulk regions Determine remaining R P , C j , and C sc J. Phillips EECS 320 Junction Resistance 1 1 = = A P P dV dI G R kT qI e I kT q dV dI kT qV A A = = / 0 ( ) kT qV kT qV A A e I e I I / 0 / 0 1 = qI kT R P =
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J. Phillips EECS 320 Junction Capacitance dV dQ C diff = A W qN A W qN Q n d p a = = () ( ) W A N N V V N N q A C a d a bi d a j ε = + = 2 () a bi bi j j V V V C C = 0 Change in depletion region fixed charge
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14 - PN transient - EECS 320 P-N Diode: Transient Response...

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