Charge recovery logic for thermal harvesting applications

Leo Filippini, B. Taskin
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Abstract

This paper investigates the substitution of CMOS or near-threshold CMOS with Charge Recovery Logic (CRL) in applications where energy is thermally harvested. By doing so, it is possible to eliminate the bulky DC/DC stage needed to provide the supply voltage for CMOS operation. Instead, a simple LC-tank oscillator is used to generate a power-clock suitable for CRL operation. Simulation results of a 256-stage inverter chain designed in Efficient Charge Recovery Logic (ECRL) are presented. Two additional novelties are presented i) using ECRL at a near-threshold voltage and ii) generating the four-phase power-clock by means of a quadrature oscillator. The traditional, full-swing CMOS system dissipates 18.2× the power dissipated by the proposed TP-ECRL system.
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热收集应用的电荷恢复逻辑
本文研究了用电荷恢复逻辑(CRL)替代CMOS或近阈值CMOS在热能量收集应用中的应用。通过这样做,可以消除为CMOS操作提供供电电压所需的笨重的DC/DC级。相反,使用一个简单的LC-tank振荡器来生成适合CRL操作的功率时钟。给出了采用高效电荷恢复逻辑(ECRL)设计的256级逆变链的仿真结果。提出了另外两种新颖的方法:1)在接近阈值的电压下使用ECRL; 2)通过正交振荡器产生四相功率时钟。传统的全摆幅CMOS系统功耗是TP-ECRL系统功耗的18.2倍。
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