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      A CMOS fully-differential bandpass ΣΔ modulator using switched-current circuits 

      Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995)
      This paper presents a fourth-order bandpass sigma-delta modulator that has been designed using fully-differential ...
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      A fourth-order bandpass ΣΔ modulator using current-mode analog/digital circuits 

      Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996)
      We present a fourth-order bandpass ΣΔ switched-current modulator IC in 0.8 μm CMOS single-poly technology. Its architecture ...
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      Non-ideal quantization noise shaping in switched-current bandpass ΣΔ modulators 

      Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1999)
      This paper presents a systematic analysis of the major switched-current (SI) errors and their influence on the quantization ...