Noise and Spurious in Digital Systems and Digitized Signals
High Frequency Electronics
We are all aware of the rapidly increasing use of digital circuitry in com-munications equipment, instruments, and other traditionally analog sys-tems. The digital portion of those systems began as post-processing analysis, and has gradually migrated up the signal chain to real-time baseband signal pro-cessing, to IF and up/down conversion stages, and to feedback and other control circuitry. Although still largely developmental, there are radio systems that directly digitize the input RF and present the final transmitted signal to a power amplifier (or the antenna for low-power, short range operation).
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