Digital Frequency Domain Multiplexer for Millimeter-Wavelength Telescopes
- 8 February 2008
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 55 (1) , 21-26
- https://doi.org/10.1109/tns.2007.911601
Abstract
An FPGA based digital signal processing (DSP) system for biasing and reading out multiplexed bolometric detectors for mm-wavelength telescopes is presented. This readout system is being deployed for balloon-borne and ground based cosmology experiments with the primary goal of measuring the signature of inflation with the Cosmic Microwave Background Radiation. The system consists of analog superconducting electronics running at 250 mK and 4 K, coupled to digital room temperature backend electronics described here. The digital electronics perform the real time functionality with DSP algorithms implemented in firmware. A soft embedded processor provides all of the slow housekeeping control and communications. Each board in the system synthesizes multi-frequency combs of 8 to 32 carriers in the MHz band to bias the detectors. After the carriers have been modulated with the sky-signal by the detectors, the same boards digitize the comb directly. The carriers are mixed down to base-band and low pass filtered. The signal bandwidth of 0.050 Hz-100 Hz places extreme requirements on stability and requires powerful filtering techniques to recover the sky-signal from the MHz carriers.Keywords
All Related Versions
This publication has 8 references indexed in Scilit:
- APEX-SZ first light and instrument statusNew Astronomy Reviews, 2006
- SCUBA-2: a 10,000-pixel submillimeter camera for the James Clerk Maxwell TelescopePublished by SPIE-Intl Soc Optical Eng ,2006
- The EBEX experimentPublished by SPIE-Intl Soc Optical Eng ,2004
- The Atacama Cosmology Telescope ProjectPublished by SPIE-Intl Soc Optical Eng ,2004
- Frequency domain multiplexing for bolometer arraysNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004
- DC SQUID series array amplifiers with 120 MHz bandwidth (corrected)IEEE Transactions on Applied Superconductivity, 2001
- Superconducting multiplexer for arrays of transition edge sensorsApplied Physics Letters, 1999
- An economical class of digital filters for decimation and interpolationIEEE Transactions on Acoustics, Speech, and Signal Processing, 1981