7 pn Junction Diode: Small-signal Admittance

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Presentation transcript:

7 pn Junction Diode: Small-signal Admittance

small signal voltage : Va ac current : i small signal admittance: Y = G +jωC

7.2 REVERSE-BIAS JUNCTION CAPACITANCE 7.2.1 General Information C-V characteristics of pn diode

Junction or depletion layer capacitance Charge density oscillation with a.c signal (7.2)

7.2.2 C-V Relationships (7.3) and (7.4) (7.5) Vbi→Vbi-VA One sided power law profiles (7.3) and (7.4) (7.5)

Depletion region width for one sided power-law profiles (7.6) (7.7) (7.8) For varactor , tuning ratio

7.2.3 Parameter Extraction/Profiling Form C-V plot Doping concentration versus position (7.11) (7.12) (7.13) Example 7.2

7.2.4 Reverse-Bias Conductance Differential dc conductance of a diode : When the reverse bias exceed a few kT/q, G0→0 When the dc recombination-generation current dominates in the given diode, (7.14) (7.15) (7.16)

7.3 FORWARD-BIAS DIFFUSION ADMITTANCE 7.3.1 General Information The admittance due to the minority carries charge oscillation