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ELECTRONICS TECHNOLOGY • Semiconductor Devices I – Limiters Benchmark Companies Inc PO Box 473768 Aurora CO 80047 Diodes Objective 2 Basic Diode Configurations in a circuit 1. Series Negative Limiter 2. Series Positive Limiter 3. Parallel Positive Limiter 4. Parallel Negative Limiter Back Diodes Series Negative Limiter Negative voltage is limited And positive voltage is passed forward Positive Alteration (Forward Biased) Input Waveform Series Negative Limiter Output waveform Back Diodes Series Negative Limiter Negative voltage is limited And positive voltage is passed forward Negative Alteration (Reversed Biased) Input Waveform Series Negative Limiter Output waveform Back Diodes Series Negative Limiter Negative voltage is limited And positive voltage is passed forward Positive Alteration (Forward Biased) Input Waveform Series Negative Limiter Output waveform Back Diodes Series Negative Limiter Negative voltage is limited And positive voltage is passed forward Complete Cycle Input Waveform Series Negative Limiter Output waveform Back Diodes Series Negative Limiter Output vs. Input voltage Back Diodes Series Positive Limiter Positive voltage is limited And negative voltage is passed forward Positive Alteration (Reversed Biased) Input Waveform Series Positive Limiter Output waveform Back Diodes Series Positive Limiter Positive voltage is limited And negative voltage is passed forward Negative Alteration (Forward Biased) Input Waveform Series Positive Limiter Output waveform Back Diodes Series Positive Limiter Positive voltage is limited And negative voltage is passed forward Positive Alteration (Reversed Biased) Input Waveform Series Positive Limiter Output waveform Back Diodes Series Positive Limiter Positive voltage is limited And negative voltage is passed forward Complete Cycle Input Waveform Series Negative Limiter Output waveform Back Diodes Series Positive Limiter Output vs. Input voltage Back Diodes • Series Limiter’s Purpose – Series Limiters allow for the designer to determine current flow through the R(load) Back Diodes Parallel Positive Limiter Positive voltage is limited (diode is a short) And Negative voltage is passed forward Positive Alteration Diode is Forward Biased Input Waveform Parallel Positive Limiter Output waveform Back Diodes Parallel Positive Limiter Positive voltage is limited And Negative voltage is passed forward Negative Alteration Diode is Reversed Biased Input Waveform Parallel Positive Limiter Output waveform Back Diodes Parallel Positive Limiter Positive voltage is limited And Negative voltage is passed forward Positive Alteration Diode is Forward Biased Input Waveform Parallel Positive Limiter Output waveform Back Diodes Parallel Positive Limiter Positive voltage is limited And negative voltage is passed forward Complete Cycle Input Waveform Parallel Positive Limiter Output waveform Back Diodes Parallel Positive Limiter Output vs. Input voltage Back Diodes Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward Positive Alteration Diode is Reverse Biased Input Waveform Parallel Negative Limiter Output waveform Back Diodes Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward Negative Alteration Diode is Forward Biased Input Waveform Parallel Negative Limiter Output waveform Back Diodes Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward Positive Alteration Diode is Reverse Biased Input Waveform Parallel Negative Limiter Output waveform Back Diodes Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward Complete Cycle Input Waveform Parallel Negative Limiter Output waveform Back Diodes Parallel Negative Limiter Output vs. Input voltage Back Diodes • Parallel Limiter’s Purpose – Parallel Limiters allow for the designer to determine Voltage drop across R(load). Back Diodes Diode Limiter Summary • Series Limiter’s Purpose – Series Limiters allow for the designer to determine current flow through the R(load) • Parallel Limiter’s Purpose – Parallel Limiters allow for the designer to determine Voltage drop across R(load). Back Diodes End of Limiter Lesson Back
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