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Approximations often are used in diode circuits because diode resistance is not constant For diode circuits, the first approximation ignores the forward voltage drop across the diode The second approximation takes into account a typical value for the diode voltage drop A third approximation uses additional information about the diode, often in the form of a graph, as shown in the illustration to the right The curve is the characteristic current-volatage curve for the diode The straight line shows current-voltage conditions for all possible diode voltage drops for a 180- resistor, a 18-V battery, and a diode, from a zero diode voltage drop and 100 mA at one end, to a 18-V drop, 00 mA at the other end Use the diode circuit in Example Problem 4 with Vb 18 V, but with R 180 : 1 Determine the diode current using the first approximation 2 Determine the diode current using the second approximation

Voltage (V)

Figure 29-12 Compare the circuit symbols used to represent a pnp-transistor (a) and an npntransistor (b)

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A transistor is a simple device made of doped semiconductor material An npn-transistor consists of layers of n-type semiconductor on either side of a thin p-type layer The central layer is called the base and the regions on either side are the emitter and the collector The schematic symbols for the two transistor types are shown in Figure 29-12 The arrow on the emitter shows the direction of conventional current The operation of an npn-transistor is illustrated in Figure 29-13 The two pn-junctions in the transistor can be thought of as initially forming two back-to-back diodes The battery on the right, VC, keeps the collector more positive than the emitter The base-collector diode is reverse-biased, with a wide depletion layer, so there is no current from the collector to the base When the battery on the left, VB, is connected, the base is more positive than the emitter That makes the base-emitter diode forward-biased, allowing current IB from the base to the emitter The very thin base region is part of both diodes in the transistor The charges injected by IB reduce the reverse bias of the base-collector diode, permitting charge to flow from the collector to the emitter A small change in IB thus produces a large change in IC The collector current causes a voltage drop across resistor RC Small changes in the voltage, VB, applied to the base produce large changes in the collector current and thus changes in the voltage drop across RC As a result, the transistor amplifies small voltage changes into much larger changes If instead the center layer is an n-type region, then the device is called a pnp-transistor A pnp-transistor works the same way, except that the potentials of both batteries are reversed Current gain The current gain from the base circuit to the collector circuit is a useful indicator of the performance of a transistor Although the base current is quite small, it is dependent on the base-emitter voltage that is controlling the collector current For example, if VB in Figure 29-13 is removed, the collector current will drop to zero If VB is increased, the base current, IB, increases The collector current, IC, will also increase, but many times more (perhaps 100 times or so) The current gain from the base to the collector ranges from 50 to 300 for general-purpose transistors.

Diode Laser A typical diode laser emits light at 800 nm, which is the near infrared The beam is output from a small spot on a GaAlAs chip, and when powered by 80 mA, the diode has a forward voltage drop of about 2 V Diode lasers commonly are used in optical fiber transmissions

Make a series circuit with a DC power supply, a 470- resistor, and a red LED Connect the short lead of the LED to the negative side of the power supply which is plugged into a GFCI-protected receptacle Attach the other lead to the resistor Connect the remaining resistor lead to the positive side of the power supply Slowly increase the voltage until the LED glows Note the voltage setting on the power supply 1 Hypothesize what will happen if you reverse the direction of current 2 Experiment by reversing the connections to the battery Analyze and Conclude 3 Explain your observations in terms of LED characteristics

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