← 返回 JSSC 论文列表JSSC 2010第7期RF & Wireless0.18μm CMOSDelta-Sigma ADCOp-Amp
Power Reduction in Continuous-Time Delta-Sigma Modulators Using the Assisted Opa
通过辅助运放技术降低连续时间Delta-Sigma调制器的功耗
92.5 dB动态范围, 110μW功耗, 1.8V电源
连续时间Delta-Sigma调制器辅助运放功耗降低NRZ DACSCR-DAC
▸创新点1:辅助运放积分器设计(电路创新)。通过引入辅助运放,显著降低了第一积分器中运放的摆率要求,从而减少了功耗,同时保持了低失真性能。
▸创新点2:低失真低功耗操作(方法创新)。采用辅助运放技术,实现了在低功耗条件下的低失真操作,解决了传统设计中高摆率要求与功耗之间的矛盾。
▸创新点3:NRZ和SCR反馈DAC实现(电路创新)。分别实现了基于NRZ和SCR反馈DAC的单比特调制器,验证了辅助运放积分器在不同反馈结构中的有效性,并展示了优异的动态范围和功耗表现。
▸创新点4:高性能指标验证(系统创新)。在0.18μm CMOS工艺下设计的音频调制器,分别实现了92.5 dB和91.5 dB的动态范围,功耗仅为110μW和122μW,FOM达到175.9 dB和174.4 dB,与多比特设计相当。
Abstract
The opamp in the first integrator of a high resolu-
tion single-bit continuous-time /1/6 modulator has stringent slew
rate requirements, which increases power dissipation. We intro-
duce the “assisted opamp” integrator, which is a way of achieving
low distortion operation with low power consumption. We present
circuit implementations of our technique for single-bit modulators
using NRZ and switched-capacitor-resistor (SCR) feedback DACs.
Audio modulators designed in a 0.18
m CMOS technology are
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