V.J. Wilson anxiously awaits the return of his prototype of a factory automation wireless link. He has thoroughly ― he believes ― analyzed his entire design. With a carefully crafted spreadsheet, he defined a system architecture and passed specifications on to the circuit designers. The design team completed block designs and simulated their performance. As time is of the essence, and prototyping costs are high, the team is putting together the transceiver in a single pass prototype. The prototype comes back, and disaster strikes. Absolutely nothing works. Apparently, the duplexer designer misread the lower corner of the transmit channel from the spreadsheet. Then, the LNA designer created an oscillator instead of an amplifier because he incorrectly entered the f_T of his transistor. Third, and worst of all, V.J. himself mis-defined a splitter isolation term causing the receiver LO to leak out onto the antenna.
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