RectifierCircuit

Tin

Half-Wave Rectifier

Cause of ripple: the capacitor is discharged for almost an entire period.

inversion

Ripple Reduction: Do not allow the capacitor to discharge so frequently

If Vin >0, D1 and D2 are off.If Vin <0, D1 and D2 are on and Vout>0.

If Vin >0, D1 and D2 are on, Vout>0.If Vin <0, D1 and D2 are off.

Inverting

Non-Inverting

Alternative Drawing

Inverting Non-InvertingFull-Wave A.K.A. Bridge Rectifier

Vout=-Vin-2VD, on Vout=Vin-2VD, on

|Vin|<2VD,on

Modification:1.Turn-on voltage2.1/2 to account for inversion of negativepeaks.

VB=VD,on

VA=VP

VAB=VP-VD,on

Maximum reverse voltage is approximately Vp

Vp is the amplitude of Vin

A reverse diode voltagemust sustain larger reverse bias voltage

Limit the signal amplitude at a suitable point in the receiver

Electronic systems typically provide a global supply voltage: 3V

Design of some circuits will be simplified if they from a higher supply voltage.

Floating Capacitor Capacitor Divider

Ideal diode. Vout pinned to 0 V

Positive charges begin to leave the leftPlate of C1, turning D1 off.

C1 is now a floating capacitor

Peak Detector0 to 2Vp waveform

Application:

We may need to shift the average level of a signal up and down because the subsequent stage (e.g. an amplifier) may not operate properly with the present dc level.

CK is 1: I1=1, diodes are shorted, and Vin=Vout.

CK is 0,diodes are off, charges are storedacross C1.