Download PDF by A. Basak: Analogue Electronic Circuits and Systems

By A. Basak

ISBN-10: 0521360463

ISBN-13: 9780521360463

It is a primary ebook on analogue circuitry for college kids of electric and digital engineering. Analogue circuits are utilized in a variety of fields, equivalent to microcomputer interplay and computer-aided layout (CAD). issues coated contain transistor circuit concepts and amplifiers, operational amplifiers, oscillators, part locked loops, modulation, facts acquisition and distribution, and computer-aided circuit layout. simple electronics were passed over in order that acceptable emphasis may be given to the layout of the preferred and valuable circuits, and the writer concentrates at the functional info and functions of the cloth he covers. moreover, every one bankruptcy additionally incorporates a major variety of labored examples and several other rigorously selected difficulties at a number of degrees of hassle.

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Example text

By observing Fig. 81) Fig. 33. A class C amplifier. + Vc< Power amplifiers 49 Fig. 34. Input voltage and output current of a class C amplifier. 6C depends on V and FBB. 7 V 2/r Output current' where VBB is the bias voltage and V is the peak input voltage. The efficiency of this amplifier is large because the transistor is cut-off during most of every full cycle of the input, thus dissipating a very small amount of power. In fact, as the conduction angle approaches zero, the efficiency of the amplifier approaches 100%.

Another interesting application of the Darlington circuit is as an emitter follower. It provides an excellent buffering between a high impedance source and a low impedance load. Fig. 9. Darlington circuit. c. resistance looking into the base of Q2 of the circuit in Fig. 18) where r e2 is the small-signal base-emitter resistance of Q2. We can say kT Since re = — for small-signal models. kT „ From Fig. 22) Darlington pairs are usually fabricated on a single chip and Qx and Q2 have the same characteristics.

4 Transistors Q1? Q2, 2 3 and ^4 in the circuit of Fig. 4 are all identical and each has a current gain of 55. c. output voltages at terminals Bx and B2. 7 volts. Solution The transistors Q3 and Q4 form a current mirror. -. 7 x l 0 3 x l . 4 Darlington connection If we connect two transistors together as shown in Fig. 9, the configuration is called a Darlington pair. It behaves like a single transistor with an effective current gain approximately equal to the product of the current gains of the two transistors.

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Analogue Electronic Circuits and Systems by A. Basak


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