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Diode Circuits

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Voltage Regulation

RectiferCircuit

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Tin

Hal-Wave Rectifer

Cause o ripple: the capacitor is discharged or almost an entire period.

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inversion

Ripple Reduction: Do not allow the capacitor to discharge so reuentl!

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"n #nverting Hal-WaveRectifer

# Vin$%& D' and D( are o).

# Vin*%& D' and D( are on

and Vout$%.

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"n +on-#nverting Hal-WaveRectifer

# Vin$%& D' and D( are on&

Vout$%.

# Vin*%& D' and D( are o).

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,ull-Wave Rectifer

#nverting

+on-#nverting

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,ull-Wave Rectifer"lternative Drawing

#nverting +on-#nverting,ull-Wave "..". ridgeRectifer

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/sing Constant VoltageDiode 0odel

Vout1-Vin-(VD& on Vout1Vin-(VD& on

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#nput versus 2utput

3Vin3*(VD&on

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"ddition o the 4moothingCapacitor

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0odifcation o Ripple5stimation ,ormula

0odifcation:'.Turn-on voltage(.'6( to account or inversion o negativepea7s.

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0a8imum Reverse Voltage

V1VD&on

V"1V9

V"1V9-VD&on

0a8imum reverse voltage is appro8imatel! Vp

Vpis the amplitude o Vin

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Compare 0a8imum Reverse iasVoltage to Hal-Wave Rectifer

" reverse diode voltagemust sustain larger reverse ias voltage

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Currents as a unction otime

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"pplication o ridgeRectifer

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4ummar!

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"pplication o ;imitingCircuits

;imit the signal amplitude at a suitale point in the receiver

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Characteristic o a ;imitingCircuit

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" 4imple ;imiter

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"pplication o VoltageDouler

5lectronic s!stems t!picall! provide a gloal suppvoltage: =V

Design o some circuits will e simplifed i the! ra higher suppl! voltage.

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Voltage Douler

,loating Capacitor Capacitor Divider

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Capacitor Diode Circuit#deal diode.

Vout pinned to % V

9ositive charges egin to leave the let9late o C'& turning D' o).

C' is now a >oating capacitor

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9ea7 Detector

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Voltage Douler

9ea7 Detector% to (Vp waveorm

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Diode as a Voltage 4hiter

"pplication:

We ma! need to shit the average level o a signal upand down ecause the suseuent stage ?e.g. an ampliferma! not operate properl! with the present dc level.

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" 4imple ;evel 4hit

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4hit up the DC ! ( VD& 2n

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" simple electronic switch

C is ': #'1'& diodes are shorted& andVin1Vout.

C is %&diodes are o)& charges are storedacross C'.