Abstract Details
| Name: Akshaya V G Affiliation: Raman Research Institute Conference ID: ASI2025_588 Title : RFSoC-based digital spectrometer for APSERa Authors and Co-Authors : Akshaya V. G. 1, Srivani K.S. 1, Girish B.S. 1, Mayuri S. Rao 1, Kamini P.A. 1, Keerthipriya S. 1, Narendra S. 1, Somashekar R. 1 Abstract Type : Poster Abstract Category : Facilities, Technologies and Data science Abstract : The Epoch of Recombination is a pivotal period in cosmological history, during which the hot plasma of the early Universe cooled and transitioned into an atomic state. Cosmological Recombination Radiation (CRR) lines that are emitted by the process of the formation of the first atoms over this era appear as additive ripples in the Cosmic Microwave Background spectrum. APSERa, the Array of Precision Spectrometers for the Epoch of Recombination, is an upcoming cosmology experiment aimed at detecting CRR over 2-4 GHz where the sensitivity for a ground-based detection is expected to be the highest. On completion, APSERa will comprise a 128-element array with custom-designed antennas and cutting-edge electronics. The prototype APSERa element employs a Xilinx ZCU111 evaluation board based on Radio Frequency System-On-a-Chip (RFSoC) at the core of its Digital Correlation Spectrometer. This board includes 8 high-speed 12-bit ADCs, each capable of sampling at up to 4.096 GSPS, of which 2 ADCs are used for digitization of bandwidths of about 2 GHz. The correlation spectrometer is realized inside the RFSoC using 16384-point split-FFT architecture (M*N) through a combination of sixteen parallel, pipelined streaming 1024-point FFT IP cores, complex multipliers for phase correction, and a custom-designed 16-point parallel FFT engine. Complex Multiplier and Accumulator performs on-chip integration of the FFT spectra for about 16.77 ms to produce two autocorrelation spectra and one cross-power spectrum. This data is streamed via 1-gigabit ethernet to a laptop. In this talk, the architecture of the digital correlation spectrometer implemented on the RFSoC and the preliminary results from this digital receiver will be presented. |