A novel two-channel time-interleaved second-order ΣΔ modulator

Abstract

To alleviate the folded noise caused by coefficient mismatches between the two channels of two-channel time-interleaved (TI) ΣΔ modulators and simplify the circuit of the modulators, a novel two-channel TI second-order ΣΔ modulator is proposed. A new type of noise transfer function (NTF) which is a band-pass filter is adopted for the modulator to reduce the folded noise. The simulation results show that this two-channel TI second-order ΣΔ modulator is insensitive to channel mismatches. Moreover, the modulator only needs three operation amplifiers.