A Caltech Library Service

ADC Crosstalk Measurements with SNAP for OVRO-LWA

Atwater, Jackson and D'Addario, Larry and Kocz, Jonathon (2018) ADC Crosstalk Measurements with SNAP for OVRO-LWA. OVRO-LWA Memo, 3. , Pasadena, CA. (Unpublished)

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


The LWA (Long-Wavelength Array), located at Owens Valley Radio Observatory, is a powerful and sensitive radio telescope. OVRO-LWA needs very good signal transmission with minimal spurious emissions carried through its signal chain. The telescope receives analog radio signals from space, then interprets them as digital data that can be computationally analyzed to gain a better understanding of what that data means. A high-level description of the flow of information in the LWA is as follows: Analog receiver → analog-to-digital conversion (ADC) → short-timescale FPGA processing → long-timescale GPU processing In order to minimize unwanted effects, some parts of the signal chain are being redesigned. This includes possible changes in the ADCs employed, the FPGA used, or the circuitry linking the two. A variety of options are available for the new hardware, including several boards from the CASPER1 collaboration. Currently, the LWA uses CASPER ADC16x250-8 RJ45 rev 1 boards with HMCAD1511 ADC chips. A different CASPER board, or a new combination of ADC and FPGA hardware from multiple platforms, may be used. Among the candidate replacement boards is SNAP2 (Smart Network ADC Processor). In order to determine the viability of retooling the SNAP board for this purpose, the performance characteristics of its ADC hardware have been tested.

Item Type:Report or Paper (Technical Report)
Kocz, Jonathon0000-0003-0249-7586
Group:Owens Valley Radio Observatory (OVRO), Owens Valley Radio Observatory (OVRO). OVRO-LWA Memos
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Series Name:OVRO-LWA Memo
Issue or Number:3
Record Number:CaltechAUTHORS:20230212-023805143
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:119224
Deposited By: Joy Painter
Deposited On:13 Feb 2023 18:24
Last Modified:04 May 2023 23:05

Repository Staff Only: item control page