• Semiconductor Devices I– Limiters

ELECTRONICS TECHNOLOGY

Benchmark Companies Inc

PO Box 473768

Aurora CO 80047

Diodes

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Objective 2 Basic Diode Configurations in a circuit

1. Series Negative Limiter

2. Series Positive Limiter

3. Parallel Positive Limiter

4. Parallel Negative Limiter

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Series Negative Limiter Negative voltage is limited And positive voltage is passed forward

Output waveformSeries Negative LimiterInput Waveform

Positive Alteration

(Forward Biased)

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Series Negative Limiter Negative voltage is limited And positive voltage is passed forward

Output waveformSeries Negative LimiterInput Waveform

Negative Alteration(Reversed Biased)

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Series Negative Limiter Negative voltage is limited And positive voltage is passed forward

Output waveformSeries Negative LimiterInput Waveform

Positive Alteration(Forward Biased)

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Series Negative Limiter Negative voltage is limited And positive voltage is passed forward

Output waveformSeries Negative LimiterInput Waveform

Complete Cycle

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Series Negative Limiter

Output vs. Input voltage

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Series Positive Limiter Positive voltage is limited And negative voltage is passed forward

Output waveformSeries Positive LimiterInput Waveform

Positive Alteration(Reversed Biased)

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Series Positive Limiter Positive voltage is limited And negative voltage is passed forward

Output waveformSeries Positive LimiterInput Waveform

Negative Alteration(Forward Biased)

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Series Positive Limiter Positive voltage is limited And negative voltage is passed forward

Output waveformSeries Positive LimiterInput Waveform

Positive Alteration(Reversed Biased)

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Series Positive Limiter Positive voltage is limited And negative voltage is passed forward

Output waveformSeries Negative LimiterInput Waveform

Complete Cycle

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Series Positive Limiter

Output vs. Input voltage

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• Series Limiter’s Purpose– Series Limiters allow for the designer to

determine current flow through the R(load)

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Parallel Positive Limiter Positive voltage is limited (diode is a short) And Negative voltage is passed forward

Output waveformParallel Positive LimiterInput Waveform

Positive AlterationDiode is Forward Biased

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Parallel Positive Limiter Positive voltage is limited And Negative voltage is passed forward

Output waveformParallel Positive LimiterInput Waveform

Negative AlterationDiode is Reversed Biased

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Parallel Positive Limiter Positive voltage is limited And Negative voltage is passed forward

Output waveformParallel Positive LimiterInput Waveform

Positive AlterationDiode is Forward Biased

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Parallel Positive Limiter Positive voltage is limited And negative voltage is passed forward

Output waveformParallel Positive LimiterInput Waveform

Complete Cycle

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Parallel Positive Limiter

Output vs. Input voltage

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Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward

Output waveformParallel Negative LimiterInput Waveform

Positive AlterationDiode is Reverse Biased

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Output waveformInput Waveform

Negative AlterationDiode is Forward Biased

Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward

Parallel Negative Limiter

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Output waveformInput Waveform

Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward

Parallel Negative Limiter

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Positive AlterationDiode is Reverse Biased

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Output waveformInput Waveform

Complete Cycle

Parallel Negative Limiter Negative voltage is limited And positive voltage is passed forward

Parallel Negative Limiter

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Parallel Negative Limiter

Output vs. Input voltage

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• Parallel Limiter’s Purpose – Parallel Limiters allow for the designer to

determine Voltage drop across R(load).

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• Parallel Limiter’s Purpose – Parallel Limiters allow

for the designer to determine Voltage drop across R(load).

• Series Limiter’s Purpose– Series Limiters allow for the

designer to determine current flow through the R(load)

Diode Limiter Summary

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End of Limiter Lesson

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