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It s probably not a bad idea to review binary arithmetic for just a moment, since it seems to be one of the least understood details of data communications. I promise, this will not be painful. I just want to offer a quick explanation of the numbering scheme and the various codesets that result.

Why all these different expressions 279 When you move upwards ( north ) along the jB axis from the origin, you have ever-increasing capacitive susceptance. The formula for this quantity, BC, is BC 6.28fL siemens

ity is more important than gain. The stability of an oscillator is better when the output is taken from the emitter or source, as compared with taking it from the collector or drain. Variations in the load impedance are less likely to affect the frequency of oscillation, and a sudden decrease in load impedance is less likely to cause the circuit to stop oscillating. To prevent the output signal from being short-circuited to ground, an RF choke (RFC) is connected in series with the emitter or source in the Colpitts and Clapp oscillator circuits. The choke lets dc pass while blocking ac (just the opposite of a blocking capacitor). Typical values for RF chokes range from about 100 H at high frequencies, such as 15 MHz, to 10 mH at low frequencies, such as 150 kHz.

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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

where f is in Hertz and C is in farads. The value of B is in siemens. Alternatively, you can use frequency values in megahertz and capacitances in microfarads. The complex value is jB = j(6.28fC). Moving upwards along the jB axis indicates increasing capacitance values.

The Voltage-Controlled Oscillator The frequency of a VFO can be adjusted by means of a varactor diode in the tuned LC circuit. Recall that a varactor, also called a varicap, is a semiconductor diode that works as a variable capacitor when it is reverse-biased. The capacitance depends on the reverse-bias voltage. The greater this voltage, the lower the value of the capacitance. The Hartley and Clapp oscillator circuits lend themselves well to varactor-diode frequency control. The varactor is placed in series or parallel with the tuning capacitor, and is isolated for dc by blocking capacitors. In Chap. 20, we saw an example of how a varactor can be connected in a tuned circuit (Fig. 20-9). The resulting oscillator is called a voltage-controlled oscillator (VCO). Varactors are cheaper than variable capacitors or inductors. They re also less bulky. These are the chief advantages of a VCO over an old-fashioned LC tuned VFO. Diode Oscillators At ultrahigh frequencies (UHF) and microwave radio frequencies, certain types of diodes can be used as oscillators. You learned about these diodes in Chap. 20.

When you go down ( south ) along the jB axis from the origin, you encounter increasingly negative susceptance. This is inductive susceptance; the formula for it is BL 1/(6.28fL) siemens

Modern computers are often referred to as digital computers because the values they use to perform their function are limited (remember, the word digital means discrete). Those values are nominally zero and one. In other words, a value can either be one or zero, on or off, positive or negative, presence of voltage or absence of voltage, or presence of light or absence of light. Two possible values exist for any given situation, and this type of system is called binary. The word means a system that comprises two distinct components or values. Computers operate using base 2 arithmetic, whereas humans use base 10. Let me take you back to second grade. When we count, we arrange our numbers in columns that have values based on multiples of the number 10, as shown in Figure 2-6. Here we see the number 6,783, written using the decimal numbering scheme. We easily understand the number as it is written because we are taught to count in base 10 from an early age. Computers, however, don t speak in base 10. Instead, they speak in base 2. Instead of having columns that are multiples of 10, they use columns that are multiples of two, as shown in Figure 2-7. In base 10, the columns are (reading from the right):

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