A Technique to Increase the Linearity of the Bootstrapped Switch

We present a detailed investigation into a source of distortion that affects the classic bootstrapped switch. Our analysis reveals that the transition phase between track mode and hold mode is a critical factor in causing the distortion. To address this issue, we propose a novel technique that effectively mitigates the problem. Our results, based on simulations conducted using a 22-nm FDSOI CMOS process, show an improvement of at least 4 dB in the signal-to-distortion ratio, with only a minor reduction in signal bandwidth. Importantly, the increase in SDR is achieved with a minimum cost in terms of power consumption and area occupation.