An area- and power-optimized asynchronous 32x interleaved SAR ADC achieving 36 GS/s at 110mW and 1V supply on the interleaver and 0.9V on the SAR ADCs is presented. The ADC features a 2-channel interleaver with data demultiplexing for enhanced bandwidth, a power- and area optimized binary SAR ADC, and an area optimized clocked reference buffer with a tunable constant current source. It achieves 32.6 dB SNDR up to 3GHz and 31.6 dB up to 18 GHz input frequency and 98 fJ/conversion-step with a core chip area of 340x140 um2 in 32nm SOI CMOS technology.