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
Publication date
January 1995
DOI Publisher
Institute of Electrical and Electronics Engineers (IEEE)Abstract
This paper presents a fourth-order bandpass sigma-delta modulator that has been designed using fully-differential switched-current circuits in a 0.8μm CMOS technology. The modulator prototype has been obtained by applying a lowpass to bandpass transformation to a second-order lowpass ΣΔ modulator. Specifications are SNR 60dB@2.5Mhz±15Khz, for a clock frequency of 1OMhz. Preliminary results from the fabricated prototype obtains the correct noise shaping up to 2.5Mhz clock frequency
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