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Time-interleaved (TI) sigma-delta modulators are sensitive to channel-mismatches. In this paper, a new type of noise transfer function (NTF) which is a band-pass filter is adopted for the two-channel TI modulators to reduce the folded noise. Employing the concept of block digital filtering and theory of multirate operations, a novel two-channel TI high-order modulator is derived from the prototype...
In this paper, a novel single-loop high-order multi-bit sigma-delta modulator (SDM) architecture is proposed for broadband applications. This architecture employs the technique of double-sampling to double the sampling frequency of the SDM without increasing the clock frequency. To reduce the noise folded into the signal band in a double-sampling SDM, an additional zero is placed at the half of the...
In this paper, a novel 2-3 two-stage fifth-order multi-bit cascade sigma-delta modulator (SDM) architecture is proposed for broadband applications. For low oversampling applications, in order to resolve the problem of the sensitivity to the nonlinear and finite gain of operational amplifier (op-amp) in the traditional cascade SDM architecture, the first stage of the proposed SDM architecture employs...
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