Receivers

Introduct

The receiver's function is to amplify the detected signals with minimum distortion and loss of fidelity, and provide these signals, either in W-band, or in a lower frequency range, into room temperature environment for further signal processing and correlation. The receiver's function is to amplify the detected signals with minimum distortion and loss of fidelity, and provide these signals, either in W-band, or in a lower frequency range, into room temperature environment for further signal processing and correlation.

Each receiver package includes a vacuum chamber housing with proper pumping facility, a 15K cooling cold-head, helium supply lines and compressor for the cold-head, and adequate supporting structures for the receiver. For signal processing, each receiver will be equipped with the following key components: One vacuum window, one corrugated feed-horn, W-band isolators, W-band LNAs, fundamental/sub-harmonic mixers, post amplifiers, necessary wave-guide components, and vacuum wave-guide feed-through, etc. For RF components biasing, the receiver will be equipped with electrical feed-through with filtering functioning.

Components to be supplied to this work package from others will include a stable LO source, W-band LNAs, harmonic mixers, isolators, and post amplifiers etc. All the related bias circuitry should be included in the supplied packages. The front-end optics is not included in this work package; neither are the clean AC power to supply the entire receiver system and cold-head compressors.

 

AMiBA Receiver Schematic AMiBA Prototype Receiver Design

Principle Specifications of Prototype AMiBA Receiver


Band Center 95 GHz
Bandwidth 20 GHz (or max)
Effective Bandwidth 16 GHz
System Temperature 100K
Receiver Channel per Receiver Full dual channels
Polarization Linear
LO frequency (Sub-harmonic mixing) 42 x 2 GHz
IF Frequency DC-20 GHz
Antenna Diameter 1.2 & 0.31 m
Number of Receivers 2
Cryogenics Close-cycled, two-stage GM fridge, 10K/80K