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RF Digital Signal Generation Beyond Nyquist

This paper discusses low cost RF signal generation for BIST, using only digital circuits. One major problem is the range of frequencies that can be achieved by any digital signal generator, since the Nyquist limit is the clock frequency divided by 2 (FS/2). The proposed method uses the images of the signal in order to reach frequencies beyond FS/2. Different digital signal generation techniques for RF and their limitations are addressed as well as their impact in the framework of analog RF BIST. Experimental results and comparisons are provided using a gigabit transceiver