A 1V 663μW 15-bit audio Δσ modulator in 0.18μm CMOS

Liyuan Liu,Dongmei Li,Liangdong Chen,Chun Zhang,Shaojun Wei,Zhihua Wang

Proceedings of 2010 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2010（2010）

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摘要

A 15-bit 3rd order Δσ modulator is presented. The feed forward topology with 18-level quantizer is adopted. The signal swing of the 1st integrator is effectively suppressed. A current-mirror OTA with 42dB DC gain is used in the 1st integrator. Chop stabilization is employed to remove the flicker noise. The prototype is fabricated in 0.18μm CMOS. The active die area is 0.85 × 0.85mm2. The power consumption is 663μW under all 1V power supply. ©2010 IEEE.

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关键词

capacitance,topology,operational amplifiers,cmos,low voltage,flicker noise,capacitors,cmos integrated circuits,current mirrors,integrator,noise,bandwidth,circuit topology,modulation,network topology,quantizer,delta sigma modulation

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