A High Performance Sample and Hold Circuit with Double-sampling

A high performance sample and hold circuit is presented,which increases the sample rate with the double-sampling technology under the same operational amplifier.Thus reduces the require of the operational amplifier.This circuit uses two-step operational amplifier with compensate technology to gain the higher gain and larger width of the output.The boosted switches are used to eliminate the non-linear of the on-resistance of the switches.The boosted switch also diminishes the effect of charge-injection and feedthough.The circuit is suitable for the high speed and high precision pipeline ADC when we use the libraries of SMIC 0.25-μm CMOS process for simulation.