Transient Signals of pn Junction Diodes

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Presentation transcript:

Transient Signals of pn Junction Diodes

Transient Signals of pn Junction Diodes Transient signals caused by buildup of minority carrier charge Must build up charge to turn on pn diode Must remove charge to turn off diode Can test transient response by using resistor in series with pn diode Circuit diagram for pn diode time delay measurement.

Transient Signals of pn Junction Diodes Turn on transient: Must build up charge more quickly during transient to turn on diode before voltage relaxes to steady state. 3

Transient Signals of pn Junction Diodes Turn off transient: Must drop voltage across resistor to discharge current from pn diode. 4

Transient Signals of pn Junction Diodes Turn on measurements: IF = (VCh2,ss – VCh1,ss)/R Vpk - Vss tfr Turn off measurements: Vss – Voff trd Measured data for the turn on and turn off transients for square wave at 20 kHz Plot data for one representative data point for both turn on and turn off transients 5

Transient Signals of pn Junction Diodes Turn on and turn off transients generated from a 1 V to 0 V voltage transition taken on both Channel 1 and Channel 2. 6

Transient Signals of pn Junction Diodes Turn on and turn off transients for both Channels 1 and 2 for 1 V transition (top) and turn on (bottom left) and turn off (bottom right) transients for Channel 1. 7

Transient Signals of pn Junction Diodes Positive to negative transient: First reverse biases resistor to rapidly discharge current from pn diode during tsd before diode begins to approach reverse saturation current causing a rapid drop in voltage towards end of trr. 8

Transient Signals of pn Junction Diodes Measurements: VF IF = VCh1/R VR IR = VCh1/R tsd trr Measured data for positive to negative transient for square wave at 20 kHz Plot data for one representative data point for positive to negative transient 9

Transient Signals of pn Junction Diodes Reverse recovery transient generated from a 0.9 V to 0 V transition taken on Channel 1. 10

Switching transient generated from a 0.9 V to 0 V transition. Transient Signals of pn Junction Diodes Switching transient generated from a 0.9 V to 0 V transition. 11