A MASH Structure Interstage Op-Amp Sharing Σ-△ Modulator
A multi-stage noise-shaping(MASH)structure interstage op-amp sharing Σ-△ modulator was designed in a 55 nm CMOS process.A 2-2 MASH structure was used to design the modulator parameters.An improvement had been made to the classical switched-capacitor integrator and applied to the design of the modulator circuit,realizing the sharing of op-amps between the two stages of the modulator,reducing the number of op-amps while achieving high precision,and significantly decreasing the power consumption of the MASH structure modulator.Simulation results show that at a supply voltage of 3.3 V,the modulator have a signal-to-noise-and-distortion ratio of 111.7 dB,a spurious-free dynamic range of 113.6 dB,and a total power consumption of 16.84 mW.
Σ-△ modulatorinterstage op-amp sharingMASHlow power
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