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We demonstrate the Nyquist spectral shaping using a two-channel interleaved DAC with zero-order holding at the speed of the symbol rate, and investigate the required spectral preemphasis, bandwidth, and resolution. Compared to a conventional DAC at a speed of two times the symbol rate, we find that an extra spectral preemphasis is required for compensating the extra spectral roll-off in the two-channel...
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