A 120dB SNDR audio sigma-delta modulator with an asynchronous SAR quantizer
ISCAS（2012）
摘要
This paper presents a single loop 3rd order 5-bit audio ΣΔ modulator with feed forward path. Feed forward technology relaxes the amplifier design requirement by reducing output swing of the integrators. Chopper stabilization technology is employed to mitigate the flicker noise introduced by 1st integrator. A kind of asynchronous successive approximation (SAR) quantizer without extra fast clock replaces the traditional flash quantizer. Two voltage reference buffers are integrated on this chip as the input stages of Vrefp and VCMO to simplify off-chip circuits. Simulation results show that the modulator achieves 120dB SNDR under 5 kHz input signal within 20Hz~24kHz bandwidth. The modulator alone consumes only 20mW and the overall power consumption is less than 60mW from 3.3V supply. The active core area is 2.3×1 mm2 fabricated in 0.18μm standard CMOS.
更多查看译文
关键词
choppers (circuits),standard cmos,cmos integrated circuits,sigma-delta modulation,asynchronous successive approximation,off-chip circuits,sndr audio sigma-delta modulator,quantisation (signal),voltage 3.3 v,chopper stabilization,feed forward path,voltage reference buffers,bandwidth 20 hz to 24 khz,clocks,size 0.18 mum,clock,amplifier design,flash quantizer,single loop 3rd order audio σδ modulator,power 20 mw,buffer circuits,flicker noise,asynchronous sar quantizer,reference circuits,switches,modulation,capacitors
AI 理解论文
溯源树
样例
生成溯源树，研究论文发展脉络
Chat Paper
正在生成论文摘要