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404 Amplifiers and Oscillators
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(c) in-phase feedback. (d) a high-impedance load. 9. In which of the following FET amplifier types does drain current flow for exactly 50 percent of the signal cycle (a) Class A (b) Class AB1 (c) Class AB2 (d) Class B 10. The frequency at which a quartz crystal oscillator produces energy is largely dependent on (a) the load impedance. (b) the physical thickness of the quartz wafer. (c) the amount of resistance through the crystal. (d) the power-supply voltage. 11. Which bipolar amplifier type has some distortion in the signal wave, with collector current during most, but not all, of the cycle (a) Class A (b) Class AB1 (c) Class AB2 (d) Class B 12. An RF oscillator usually (a) produces an output signal with an irregular waveshape. (b) has most or all of its energy at a single frequency. (c) produces a sound that depends on its waveform. (d) employs an RC circuit to determine the output amplitude. 13. A class C amplifier can be made linear by (a) reducing the bias. (b) increasing the drive. (c) using two transistors in push-pull. (d) no means; a class C amplifier is always nonlinear. 14. A frequency synthesizer has (a) high power output. (b) high frequency drift rate. (c) exceptional stability. (d) an adjustable waveshape. 15. A graphic equalizer is a form of (a) bias control for an NPN bipolar transistor.
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(b) gain control for an RF oscillator. (c) tone control that can be used in an audio amplifier. (d) circuit for adjusting the waveform of an RF oscillator. 16. If the impedance of the load connected to the output of an oscillator is extremely high, (a) the frequency will drift excessively. (b) the power output will be reduced. (c) the oscillator might fail to start. (d) it is no cause for concern; in fact, it is a good thing. 17. Suppose a certain bipolar-transistor PA is 66 percent efficient. The output power is 33 W. The dc collector power input is (a) 22 W. (b) 50 W. (c) 2.2 W. (d) impossible to determine without more information. 18. The arrangement in the block diagram of Fig. 24-20 represents (a) a waveform analyzer. (b) an audio oscillator. (c) an RF oscillator. (d) a sine wave generator. 19. A tuned RF PA must always be (a) set to work over a wide range of frequencies. (b) adjusted for maximum power output. (c) operated at an even harmonic of the input frequency. (d) operated in class C.
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20. Class B amplification can be used to obtain low distortion for audio applications (a) by connecting two amplifiers in cascade, thereby maximizing the gain and generating a pure sine wave output. (b) by biasing the bipolar transistor or FET beyond cutoff or pinchoff, thereby ensuring that the output is in phase with the input. (c) by connecting two identical bipolar transistors or FETs, biased exactly at cutoff or pinchoff, in a push-pull configuration. (d) by biasing the bipolar transistor or FET in the middle of the straight-line portion of the characteristic curve.
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CHAPTER
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IN RADIO OR WIRELESS COMMUNICATIONS, A TRANSMITTER CONVERTS DATA INTO ELECTROMAGNETIC
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(EM) waves intended for recovery by one or more receivers. In this chapter, we ll look at how data is converted to EM waves and transmitted, and then examine how the resulting EM fields can be intercepted and received.
Oscillation and Amplification
A radio transmitter employs one or more oscillators to generate an RF signal, and amplifiers to generate the required power output. You just learned how these circuits work. Most transmitters have mixers in addition to the oscillating and amplifying stages. Signal mixing is commonly done with diodes, and was discussed in Chap. 20.
Modulation
Modulation is the process of writing data onto an electric current or EM wave. The process can be done by varying the amplitude, the frequency, or the phase of the current or wave. Another method is to transmit a series of pulses, whose duration, amplitude, or spacing is made to vary.
The Carrier The heart of a wireless signal is a sine wave known as the carrier. The lowest carrier frequency used for radio communications is a few kilohertz (kHz). The highest frequency is in the hundreds of gigahertz (GHz). For efficient data transfer, the carrier frequency must be at least 10 times the highest frequency of the modulating signal. On/Off Keying The simplest form of modulation is on/off keying. This can be done in the oscillator of a radio transmitter to send Morse code, which is a binary digital mode. The duration of a Morse-code dot is one bit (binary digit). A dash is 3 bits long. The space between dots and dashes within a charac407
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