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Cryogenic analog-to-digital converters using spread spectrum technology for coherent receivers

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Academic year: 2021

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Figure 1. The simplified system blocks from a receiver to a correlator. The light gray area is digital signal circuit in a  digitizer; the dark gray area is analog signal circuit
Figure 3. Time-interleaving ADC system blocks. The ADC consists of a quad-phase clock generator and four sub-ADCs,  which are flash ADCs
Figure 4. Sub-ADC system blocks include a sample and hold, comparators, offset correction, a binary encoder, PRBS  modulators, skew control, spread spectrum modulator, output buffers and slew control
Figure 7. (a) Waveform I is the ideal case. Waveform II contains overshoot and undershoot that enhance high order harmonics
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