A 10-MHz low-power always valid sample-and-hold circuit with low-droop rate

A 10 MHz, low-power, high-accuracy fully- differential always-valid sample-and-hold (AVSH) circuit is described. The circuit is based on the high dc gain Miller compensation operational amplifier. Its low- power make it suitable for biomedical application such that implantable smart medical devices (SMDs). The proposed circuit has been designed with CMOS 0.13 mum technology. The simulation shows that at 1.2 V supply voltage and 10 MHz of sampling frequency, the harmonic distortion is less than -52 dB for an input swing of 800 mV @ 2 MHz. The power dissipation is 1.26 mW.