Diode Circuits Voltage Regulation Rectifier Circuit Half-Wave Rectifier Tin Cause of ripple: the capacitor is discharged for almost an entire period.
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Diode Circuits Voltage Regulation Rectifier Circuit Half-Wave Rectifier Tin Cause of ripple: the capacitor is discharged for almost an entire period. inversion Ripple Reduction: Do not allow the capacitor to discharge so frequently An Inverting Half-Wave Rectifier If Vin >0, D1 and D2 are off. If Vin <0, D1 and D2 are on and Vout>0. An Non-Inverting Half-Wave Rectifier If Vin >0, D1 and D2 are on, Vout>0. If Vin <0, D1 and D2 are off. Full-Wave Rectifier Inverting Non-Inverting Full-Wave Rectifier Alternative Drawing Inverting Full-Wave A.K.A. Bridge Rectifier Non-Inverting Using Constant Voltage Diode Model Vout=-Vin-2VD, on Vout=Vin-2VD, on Input versus Output |Vin|<2VD,on Addition of the Smoothing Capacitor Modification of Ripple Estimation Formula Modification: 1. Turn-on voltage 2. 1/2 to account for inversion of negative peaks. Maximum Reverse Voltage VB=VD,on VA=VP Vp is the amplitude of Vin VAB=VP-VD,on Maximum reverse voltage is approximately Vp Compare Maximum Reverse Bias Voltage to Half-Wave Rectifier A reverse diode voltage must sustain larger reverse bias voltage Currents as a function of time Application of Bridge Rectifier Summary Application of Limiting Circuits Limit the signal amplitude at a suitable point in the receiver Characteristic of a Limiting Circuit A Simple Limiter General Limiter Circuit Application of Voltage Doubler Electronic systems typically provide a global supply voltage: 3V Design of some circuits will be simplified if they from a higher supply voltage. Voltage Doubler Floating Capacitor Capacitor Divider Capacitor Diode Circuit Ideal diode. Vout pinned to 0 V Positive charges begin to leave the left Plate of C1, turning D1 off. C1 is now a floating capacitor Generating 0 to 2Vp Waveform Peak Detector Voltage Doubler 0 to 2Vp waveform Peak Detector Diode as a Voltage Shifter 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. A Simple Level Shift Shift up the DC by 2 VD, On A simple electronic switch CK is 1: I1=1, diodes are shorted, and Vin=Vout. CK is 0,diodes are off, charges are stored across C1.