Initially EBEX will use individual SQUIDS (Super Conducting Quantum Interference Devices) to read the current from each TES individually using much the same technology that is in use for the South Pole Telescope. However, a significant improvement to the readout electronics are currently in development at McGill. They involve biasing each squid at a different frequency and reading out all the frequencies simultaneously. This method is known as "Frequency Domain Multiplexing."

In EBEX, it will consist of three parts: (under construction)

  1. FPGA motherboard for digital signal processing
  2. A pair of of D/A converters converters to created the comb and nulling comb.
  3. An A/D converter to digitize the SQUID output.

Second and third part are separated out onto the mezzanine board to isolate from the FPGA circuitry.

The D/A and portion of the DSP use to synthesize the carrier comb is called the Digital Multi-Frequency Synthesized (DMFS).

The A/D and associated DSP is referred to as the Digital Multi-Frequency Demodulator (DMFD).

-- KevinMacDermid - 11 Jan 2007

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