DPTC-An FPGA-Based Trace Compression
Artikel i vetenskaplig tidskrift, 2020

Recording of flash-ADC traces is challenging from both the transmission bandwidth and storage cost perspectives. This work presents a configuration-free lossless compression algorithm, which addresses both limitations, by compressing the data on-the-fly in the controlling FPGA. Thus it can easily be used directly in front-end electronics. The method first computes the differences between consecutive samples in the traces, thereby concentrating the most probable values around zero. The values are then stored as groups of four, with only the necessary least-significant bits in a variable-length code, packed in a stream of 32-bit words. To evaluate the efficiency, the storage cost of compressed traces is modeled as a baseline cost including ADC noise, and a cost for pulses that depends on amplitude and width. The free parameters and the validity of the model are determined by compressing artificial traces with varying characteristics. The compression method was also applied to actual data from different types of detectors. A typical storage cost is around 4 to 5 bits per sample. Code for the FPGA implementation in VHDL and for the CPU decompression routine in C are available as open source software, both able to operate at speeds of 400 Msamples/s.

Field programmable gate arrays

open source

VHDL

Analog-to-digital conversion (ADC)

Bandwidth

Encoding

real-time data acquisition

variable-length code

field programmable gate array (FPGA)

Data compression

data compression

front-end electronics

lossless compression

VHDL

Detectors

Central Processing Unit

data acquisition

Författare

Giovanni Bruni

Chalmers, Fysik, Subatomär fysik och plasmafysik

Håkan T Johansson

Subatomär, högenergi- och plasmafysik

IEEE Transactions on Circuits and Systems I: Regular Papers

1549-8328 (ISSN)

Vol. 67 1 189-197

Ämneskategorier

Sannolikhetsteori och statistik

Reglerteknik

Annan elektroteknik och elektronik

DOI

10.1109/TCSI.2019.2945179

Mer information

Senast uppdaterat

2020-02-11