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[Author] Jungyoon LEE(1hit)

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  • A Time-Interleaved Switched-Capacitor Band-Pass Delta-Sigma Modulator with Recursive Loop

    Minho KWON  Jungyoon LEE  Gunhee HAN  

     
    PAPER-Electronic Circuits

      Vol:
    E87-C No:5
      Page(s):
    785-790

    A band-pass delta-sigma modulator (BPDSM) is a key building block to implement a digital intermediate frequency (IF) receiver in a wireless communication system. This paper proposes a time-interleaved (TI) switched-capacitor (SC) BPDSM architecture that consists of 5-stage TI blocks with recursive loop. The proposed TI BPDSM provides reduction in the clock frequency requirement by a factor of 5 and relaxes the settling time requirement to one-fourth of conventional approach. The test chip was designed and fabricated for a 30-MHz IF system with a 0.35-µm CMOS process. The measured peak SNR for a 200-kHz bandwidth is 63 dB while dissipating 75 mW from a 3.3-V supply and occupying 1.3 mm2.

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