please help me to download the following paper, many thanks!!
1: A low-power 10-bit 50-MS/s SAR ADC using a parasitic-compensated split-capacitor DAC
2: A 0.9-V 11-bit 25-MS/s binary-search SAR ADC in 90-nm CMOS
3: A low power 10-bit 100-MS/s SAR ADC in 65nm CMOS
4: A 10-Bit, 50 MS/s, 55 fJ/conversion-step SAR ADC with split capacitor array