Abstract
The authors present a fourth-order bandpass ΣΔ switched-current modulator IC in 0.8 µm CMOS single-poly technology. It is the first reported integrated circuit realisation of a bandpass ΣΔ modulator using switched-current circuits. Its architecture is obtained by applying a lowpass to bandpass transformation (z-1 → – z-2) to a second-order lowpass modulator. It has been realised using fully-differential circuitry with common-mode feedback. Measurements show 8 bit dynamic range up to 5 MHz clock frequency.
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