A wide-band 280-MHz four-path time-interleaved bandpass sigma-delta modulator
G Bernardinis, F Borghetti, V Ferragina… - … on Circuits and …, 2006 - ieeexplore.ieee.org
IEEE Transactions on Circuits and Systems I: Regular Papers, 2006•ieeexplore.ieee.org
This paper describes a 0.35-/spl mu/m CMOS fourth-order bandpass analog-digital sigma-
delta (/spl Sigma//spl Delta/) modulator for wide-band base stations receivers. The
modulator, based on a time-interleaved four-path architecture, achieves an equivalent
sampling frequency of 280 MHz, although the building blocks operate at only 70 MHz. In
measurements, the prototype chip achieves a dynamic range of 72 dB (12 bits of resolution)
with a signal bandwidth of 4.375 MHz centered around an intermediate frequency of 70 …
delta (/spl Sigma//spl Delta/) modulator for wide-band base stations receivers. The
modulator, based on a time-interleaved four-path architecture, achieves an equivalent
sampling frequency of 280 MHz, although the building blocks operate at only 70 MHz. In
measurements, the prototype chip achieves a dynamic range of 72 dB (12 bits of resolution)
with a signal bandwidth of 4.375 MHz centered around an intermediate frequency of 70 …
This paper describes a 0.35-/spl mu/m CMOS fourth-order bandpass analog-digital sigma-delta (/spl Sigma//spl Delta/) modulator for wide-band base stations receivers. The modulator, based on a time-interleaved four-path architecture, achieves an equivalent sampling frequency of 280 MHz, although the building blocks operate at only 70 MHz. In measurements, the prototype chip achieves a dynamic range of 72 dB (12 bits of resolution) with a signal bandwidth of 4.375 MHz centered around an intermediate frequency of 70 MHz. The measured spurious-free dynamic range is 69 dB. The /spl Sigma//spl Delta/ modulator dissipates 480 mW from a 3.3-V supply, including voltage reference buffers and output pads with high-driving capabilities, and occupies 20 mm/sup 2/ of silicon area.
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