Power conversion efficiency (PCE) has been one of the key concerns for power management circuits (PMC) due to the low output power of the vibrational energy harvesters. This work reports a dynamic threshold cancellation technique for a high-power conversion efficiency CMOS rectifier. The proposed rectifier consists of two stages. one passive stage with a negative voltage converter. https://parisnaturalfoodes.shop/product-category/alive-womens-50-multi-gummy/