barcode font for excel 2016 Introduction in Software

Making UPC-A in Software Introduction

1061 Introduction
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Direct-conversion receivers (DCRs, also called zero-IF receivers; Fig 1016) have seen only limited use because of implementation complexities A DCR is
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Figure 1016 A direct conversion receiver block diagram
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Wireless Issues
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a receiver with an IF after the first mixer stage, that is fixed at or near zero frequency The RF input signal has been mixed down immediately to baseband, with the middle of the desired band translated to this zero frequency DCRs have a much lower parts count, and are thus cheaper to build, than the competing superheterodyne designs DCRs do not require an image filter or high-frequency IF filters and amplifiers since no image frequency is seen by the DC receiver, and it has no IF However, DCRs have multiple problems that make a discrete DCR almost impossible, while even RFIC designs are rife with difficulties Nonetheless, many of the DCR s limitations can, and have been, addressed relatively successfully within the domain of some of the newer RFICs, especially by companies such as Analog Devices and Maxim
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1062 Direct-conversion issues
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Most design choices have tradeoffs, and a DCR is no different Superheterodyne receivers will have more selectivity and sensitivity than an equivalent direct-conversion receiver, with most DC receivers barely able to function up to 900 MHz while attaining only 95 dBm sensitivity ( 105 dBm is a requirement in many systems) And selectivity naturally suffers in most RFIC designs because of the adoption of active low-pass filtering at baseband, so DCRs have less interference rejection than superheterodynes Many zeroIF receiver RFICs, as well, have the following problems: 1 An incidental offset voltage is caused by the self-mixing in the direct conversion receiver; the LO leakage actually mixes with the original LO signal, creating a DC voltage that can contaminate the signal of interest, lowering the SNR, and can even saturate the baseband amplifier stages 2 LO leakage through the RF sections is a large consideration in design, since the LO is very close to the frequency of the incoming RF and can be radiated by the receiver s antenna, causing in-band interference 3 Flicker-effect (1/f) noise from the mixer output can be a problem, as the down-converted signal is usually of low amplitude and low frequency (near 0 Hz), decreasing SNR 4 In very wideband and high frequency DCR receivers, the difficulty of maintaining equal amplitude and phase in both the I and Q legs, called I and Q mismatch, has been difficult to solve This will cause an increase in the BER 5 Any circuit that employs phase shifts of the incoming signal by 90 degrees, as all modern zero-IF receivers must do, undergoes compromises with noise, linearity, and power 6 Zero-IF receivers permit distortion, caused by strong signals at the mixer, to reduce sensitivity more quickly than with superheterodynes Up until quite recently, the above problems have relegated zero-IF receivers to FSK pagers and a few amateur SSB receivers But companies have attempted to get around many of these difficulties by some ingenious
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Wireless Issues
Wireless Issues
design techniques For instance, the above DC offset dilemma can be mitigated by transitioning from a direct conversion, zero-IF architecture to a very low but not zero baseband frequency This allows the operation of AC coupling into the mixer stage, which eliminates the DC offset, while applying an LO that is not at the same frequency as the RF However, costs rise because of the need for a higher-frequency ADC (The LO radiation from the antenna can also be attenuated by a high-reverse-isolation LNA) Many other improvements in DCR design will be forthcoming in the next few years Despite the above implementation problems, zero-IF receivers are becoming popular in wireless design simply because they require fewer components than the standard superheterodyne technology, and are therefore much cheaper to build 107 Prototyping
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