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Power Efficient Design of Zero-Crossing-Based Switched-Capacitor Circuits

机译:基于零交叉的开关电容器电路的节能设计

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摘要

The zero-crossing-based integrator (ZCBI) is an attractive low-power alternative to the conventional switched-capacitor integrators that are based on operational transconductance amplifiers. The zero-crossing detector (ZCD) and the current source in a ZCBI controls the charge transfer with much less static power consumption. However., the ZCBI requires the reset phase where the integrator output is reset to 0 V and this may increase the dynamic power consumption. This paper presents a couple of circuit techniques to reduce the dynamic power consumption and increase the speed/accuracy of ZCBIs. The proposed techniques have been applied to a second-order Delta-Sigma ADC and it achieves the 68.8-dB peak SNR for the bandwidth of 0.39 MHz with the power consumption of 286μW from a 1.2-V power supply.
机译:基于零交叉的积分器(ZCBI)是基于运算跨导放大器的常规开关电容器积分器的一种有吸引力的低功耗替代品。零交叉检测器(ZCD)和ZCBI中的电流源控制电荷转移,而静态功耗却要低得多。但是,ZCBI需要复位阶段,其中积分器输出复位为0 V,这可能会增加动态功耗。本文提出了两种电路技术,以减少动态功耗并提高ZCBI的速度/准确性。拟议的技术已应用于二阶Delta-Sigma ADC,在0.39 MHz的带宽下,1.2 V电源的功耗为286μW,可达到68.8 dB的峰值SNR。

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