Effect of the resonator settling behaviour on SC band-pass ΣΔ modulator performance and carrier frequency error measurement
2013
Pugliese, Andrea | Carnì, Domenico L. | Grimaldi, Domenico
The impact of the settling behaviour of operational amplifiers (op-amps) used to implement switched-capacitor resonators on band-pass sigma–delta (BPΣΔ) modulator performance is investigated. Behavioural simulations of a second-order BPΣΔ modulator are performed by means of numerical models which allow the designer to well-describe high-order dynamics occurring in real op-amp circuit implementations. The results show that high-order poles and zeros in the resonator frequency response significantly affect the overall BPΣΔ modulator performances. In the paper, the effects of the resonator settling behaviour on the dynamic parameters and the carrier frequency error measurement for a Single Quantizer Loop (SQL) BPΣΔ Analog to Digital Converter architecture are also investigated.
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