Linearity enhancement techniques for MOSFET-only SC circuits

Techniques to enhance the linearity of switched-capacitor circuits utilising MOSFET gate capacitance are presented. Practical aspects limiting accuracy are investigated. With appropriate choice of capacitor technique, all types of switched-capacitor circuit become possible in standard digital CMOS processes. A sample-and-hold amplifier employing the proposed techniques was designed using a standard 0.6 /spl mu/m digital CMOS process, and verified with simulation results to demonstrate significant linearity enhancement.