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A Noise-Coupled Time-Interleaved Delta-Sigma ADC With 4.2 MHz Bandwidth, {-} 98 dB THD, and 79 dB SNDR

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7 Author(s)
Lee, K. ; Conexant Syst., Newport Beach, CA, USA ; Jeongseok Chae ; Aniya, M. ; Hamashita, K.
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This paper describes a wideband high-linearity ¿¿ ADC. It uses noise coupling combined with time interleaving. Two versions of a two-channel time-interleaved noise-coupled ¿¿ ADC were realized in a 0.18-¿m CMOS technology. Noise coupling between the channels increases the effective order of the noise-shaping loops, provides dithering, and prevents tone generation in all loops. Time interleaving enhances the effects of noise coupling. Using a 1.5 V supply, the device achieved excellent linearity (SFDR>100 dB, THD=-98 dB) and an SNDR of 79 dB in a 4.2 MHz signal band.

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Solid-State Circuits, IEEE Journal of  (Volume:43 ,  Issue: 12 )