# Lecture 9: Limiting and Clamping Diode Circuits. Voltage Doubler. Special Diode Types.

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1 Whites, EE 320 Lecture 9 Page 1 of 8 Lecture 9: Limiting and Clamping Diode Circuits. Voltage Doubler. Special Diode Types. We ll finish up our discussion of diodes in this lecture by consider a few more applications. We ll discuss limiting and clamping circuits for diodes as well as voltage doubling circuits. Voltage Limiting Circuits These types of circuits are used to cap voltages between preset limits. These are useful as voltage protection circuitry or as signal conditioning. Examples of such circuits are shown in text Figure 4.33: 2016 Keith W. Whites

2 Whites, EE 320 Lecture 9 Page 2 of 8 A simple signal conditioning example is a circuit with the following transfer function: Then one would see this output voltage v O for this particular input voltage v I : 8 5 v I v O t A circuit with ideal diodes can be designed to realize the above transfer function from a combination of the concepts shown above in Fig. 4.33: R Ideal v I 5 V Ideal v O

3 Whites, EE 320 Lecture 9 Page 3 of 8 Clamped Capacitor Circuits An idealized circuit of this type in shown below: (Fig. 4.34b) There are three important things to note about this circuit: 1. The ideal D keeps vo C charges only when vi 0. Without a load, there is no other path for current. 3. The v C polarity is positive as shown above. With these insights, let s look at a specific example to illustrate the operation of this circuit. Consider this input voltage: (Fig. 4.34a) The capacitor C in Fig. 4.34b will eventually charge completely so that v C = 6 V. In that case, the lowest output voltage will be clamped to zero. The output voltage will appear as:

4 Whites, EE 320 Lecture 9 Page 4 of 8 (Fig. 4.34c) Hence, this is called a clamped capacitor circuit. Without the diode present in this circuit, the capacitor would not retain any net charge per period so it would never charge up to 6 V. Note that here we are looking at the steady state response. It may take a few periods for the capacitor to completely charge. We re not looking at the transient response. There are two applications of the clamped capacitor circuit discussed in the text. (a) Pulse width modulation detector. PWM is used for motor speed control, for example. The width of the pulse contains the information. To demodulate the signal, one AC couples to give zero time average voltage (i.e., 0 VDC). The signal is then passed through a clamped capacitor circuit to give a

5 Whites, EE 320 Lecture 9 Page 5 of 8 welldefined DC component, then through a low pass filter to extract the DC. This DC voltage is the time average value, which changes depending on the width of the pulses (if the period is constant, as assumed). (b) Combined clamped capacitor with peak rectifier. This is also called a voltage doubler circuit. V p cos( t) v C 1 D 1 D 2 D1 C 2 v O Clamped capacitor Halfcycle peak rectifier Ignoring the transient behavior when the input voltage is first applied, v D1 is: 2V p v D1 0 t This voltage is fed to a halfcycle peak rectifier (with R ) yielding the output voltage: 2V p v O 0 t

6 Whites, EE 320 Lecture 9 Page 6 of 8 It s obvious now why this is called a voltage doubler circuit. Special Diode Types 1. Schottky barrier diode. Often just called a Schottky diode. (Used in Laboratory #1 and in the NorCal 40A in EE 322.) These are formed from a metal and an ndoped semiconductor. The big difference from a silicon diode is a smaller forwardbias voltage drop of approximately 0.2 V. Also, because all conduction current in a Schottky diode is carried by majority carriers (electrons) there is little to no junction capacitance due to the absence of minority carrier charge accumulation in the vicinity of the depletion region. Because of this, one would expect the switching speeds of the Schottky diodes to be faster than silicon diodes, for example 2. Varactor. A reversed biased diode acting as a voltagecontrolled capacitance. (Used in the NorCal 40A in EE 322.)

7 Whites, EE 320 Lecture 9 Page 7 of 8 To understand the operation of the varactor, recall that in the pn junction: This separated charge region acts as a capacitance. As shown in the text, the junction capacitance can be expressed as C j0 C j (Similar to 3.49),(1) 1 VR V0 It is readily apparent from this equation that as V R changes, so does C j. (This model is used in Spice.) 3. Photodiodes. This is a reversed biased pn junction illuminated by light: When the pn junction is exposed to incident light in the correct frequency band(s), the incident photons can break covalent bonds in the depletion region thus generating electronhole pairs. These are swept away from the junction

8 Whites, EE 320 Lecture 9 Page 8 of 8 by the electric field in the depletion region with e to the n region and holes to the p region. Thus a reverse bias current has been generated. This is called a photocurrent. 4. Light Emitting Diode (LED). This is the reverse of the photodiode. In the LED, a pn junction is forward biased: When electronhole recombination occurs, light can be given off in certain types of semiconductors such as GaAs.

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