A 32GHz, 12.8GSps Direct Sampler and Converter for Direct Microwave Sampling for terrestrial and space applications

Next generation communication standardization is calling for more flexibility with an access to higher carrier frequencies and wider instantaneous bandwidth. We propose to tackle these challenges by introducing wideband data converter solutions capable to directly access the microwave spectrum up to Q-band $(40 \mathrm{GHz})$. After a proof of concept presented at EuMW 2021, a product has been developed based on a $2^{\text {nd }}$ generation $T / H$ die, and a specially developed ADC die in $28 \mathrm{~nm}$ process, thus allowing for a dramatic power reduction, cutting down the overall power to $2.5 \mathrm{~W}$. These two dice have been assembled in a dedicated FCBGA package to offer optimal performances with a tight power budget in a reduced footprint. With a $B_{-3 d B}$ of 32GHz at $\mathrm{T} \mathbf{j}=100^{\circ} \mathrm{C}$, the measurement frequency has been extended up to the beginning of the Q-band $(40 \mathrm{GHz})$. Performance of SFDR, $\mathrm{SNR}, \mathrm{THD}$ and ENOB are shown in X-, Ku-, and Ka-band, at a sample rate of 12.8GSps.