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A 70-MHz continuous-time CMOS band-pass ΣΔ modulator for GSM receivers is presented. Impulse-invariant-transformation is used to transform a discrete-time loop-filter transfer function into continuous-time. The continuous-time loop-filter is implemented using a transconductor-capacitor (Gm-C) filter. A latched-type comparator and a true-single-phase-clock (TSPC) D flip-flop are used as the quantizer...
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