This paper presents a 12GS/s sampling-based beamforming receiver architecture for a 2x2 antenna-array. Utilizing sample-based RF-channel summation approach eliminates all wave-length dependencies by summing up all phase-aligned input signal samples. Isolating front-end- and back-end-buffers are realized as push-pull pairs simultaneously increasing bandwidth and linearity. Bootstrapped and body-driven track-and-hold-slices sample delay-correct the input waveforms. After summation of all inputs, a total beam-forming gain of 8.9dB is achieved. The linear front-end SFDR and SNDR is >69dBc and >56dB respectively while a two-tone test reveals an IM3 of 80.6dBFS. Only a total of 30mW per antenna is drawn from a triple -0.4/0.9/1.7V supply.