A delay-based complex double-sampled resonator for use in ƒs/4 quadrature bandpass ΣΔ modulators

[摘要] References(3)Cited-By(2)This paper extends the circuit implementation of a complex ƒs/4 resonator based on integrators towards double-sampling. Next, an improved double-sampled circuit implementation of a complex ƒs/4 resonator based on delays is introduced. The key features of the proposed circuit are that mismatch does not affect the center frequency nor limit the Q-factor of the resonator and lower sensitivity towards opamp gain. To verify the analytical results extracted in this paper, simulation results are presented.

[学科分类] 电子、光学、磁材料

[关键词] ΣΔ modulator;switched-capacitor;double-sampling