Continuous-time delta-sigma modulators for high-speed A/D conversion: theory, practice and fundamental performance limits
Novel architecture for high-pass cascaded ΔΣ modulator
Analog Integrated Circuits and Signal Processing
Nanometer CMOS Sigma-Delta Modulators for Software Defined Radio
Nanometer CMOS Sigma-Delta Modulators for Software Defined Radio
Time-domain thermal noise simulation of switched capacitor circuits and delta-sigma modulators
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
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In this paper, high-pass (HP) $$\Updelta\Upsigma$$ modulators are compared against the traditional low-pass (LP) $$\Updelta\Upsigma$$ modulators. The objective of this comparison is to point out the advantages and drawbacks of the two modulators thereby allowing choosing the most suited for a given application. The metrics of comparison are the noise floor, power consumption, area and the effect of the non-idealities of all the basic blocks (i.e., operational transconductance amplifier, quantizer, switches and clocks). The comparative analysis shows that HP modulators are more suited for narrow band applications because of their immunity against DC-offset and flicker noise. For medium and wide band applications, LP modulators are preferred because of their higher robustness against switch imperfections and clock jitter.