Common Diode Applications Clippers Clampers Voltage Multipliers and

Diode Clippers A clipper (or limiter) is a circuit used to eliminate some portion

A Positive Shunt Clipper When the diode is conducting: When the diode is not

Diode Clampers A clamper (or dc restorer) sets (or restores) the dc reference of

Biased clampers allow a waveform to shifted above or below a dc reference other

Zener clampers The diodes in (a) are in a common-cathode configuration. The diodes in

Voltage Doublers n A voltage doubler provides an output that is twice its peak

Half-Wave Voltage Doubler n The term “half-wave” reflects the fact that the output capacitor

Full-Wave Voltage Doublers n The term “full-wave” reflects the fact that the output capacitors

Voltage Tripler n A voltage tripler provides a dc output voltage that is approximately

Voltage Quadrupler n A voltage quadrupler provides a dc output voltage that is approximately

A Basic Dual-Polarity Power Supply The output voltages are approximately equal to the peak

LED Level Indicators n n The LED in circuit (a) lights when the driver

Multisegment Display n Multisegment display – A device used to display alphanumeric characters (numbers,

Seven-Segment Displays n The display uses LEDs that are arranged in a figure 8

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Common Diode Applications Clippers, Clampers, Voltage Multipliers and Displays

Diode Clippers A clipper (or limiter) is a circuit used to eliminate some portion (or portions) of a waveform. n n A series clipper is in series with its load. A shunt clipper is in parallel with its load.

Series Clippers

Negative Shunt Clipper Operation

A Positive Shunt Clipper When the diode is conducting: When the diode is not conducting:

Biased Shunt Clippers

Diode Clampers A clamper (or dc restorer) sets (or restores) the dc reference of a waveform.

Clamper Operation

Biased clampers allow a waveform to shifted above or below a dc reference other than 0 V. n The dc reference is determined by the biasing voltage (VB) and the setting of the potentiometer (R 1).

Zener clampers The diodes in (a) are in a common-cathode configuration. The diodes in (b) are in a common-anode configuration.

Voltage Doublers n A voltage doubler provides an output that is twice its peak input voltage.

Half-Wave Voltage Doubler n The term “half-wave” reflects the fact that the output capacitor (C 2) is charges during one alternation of each input cycle and discharges during the other.

Half-Wave Voltage Doubler Operation

Full-Wave Voltage Doublers n The term “full-wave” reflects the fact that the output capacitors are charged during alternate half-cycles of the input signal.

Voltage Tripler n A voltage tripler provides a dc output voltage that is approximately three times the peak input voltage.

Voltage Quadrupler n A voltage quadrupler provides a dc output voltage that is approximately four times the peak input voltage.

A Basic Dual-Polarity Power Supply The output voltages are approximately equal to the peak values of the input waveform.

LED Level Indicators n n The LED in circuit (a) lights when the driver output is +5 V. The LED in circuit (b) lights when the driver output is 0 V.

Multisegment Display n Multisegment display – A device used to display alphanumeric characters (numbers, letters, symbols, and punctuation marks). n n LED displays contain some number of diodes that are connected in a common-cathode or a common-anode configuration. A liquid crystal display (LCD) consists of segments that reflect (or do not reflect) ambient light when provided an active input.

Seven-Segment Displays n The display uses LEDs that are arranged in a figure 8 configuration. n The display represented below is a common-cathode display. Each LED lights when a positive voltage is applied to the appropriate pin.