A 2-20 GHz Analog Lag-Correlator for Radio Interferometry

Details A 2-20 GHz Analog Lag-Correlator for Radio Interferometry A 2-20 GHz Analog Lag-Correlator for Radio Interferometry

2011-12-08

arxiv.org/abs/1112.1982v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

accepted for publication by IEEE Transactions on Instrumentation & Measurement

Scientific paper

10.1109/TIM.2012.2184960

We present the design and testing of a 2-20 GHz continuum band analog lag correlator with 16 frequency channels for astronomical interferometry. The correlator has been designed for future use with a prototype single-baseline interferometer operating at 185-275 GHz. The design uses a broadband Wilkinson divider tree with integral thin-film resistors implemented on an alumina substrate, and custom-made broadband InGaP/GaAs Gilbert Cell multipliers. The prototype correlator has been fully bench-tested, together with the necessary readout electronics for acquisition of the output signals. The results of these measurements show that the response of the correlator is well behaved over the band. An investigation of the noise behaviour also shows that the signal-to-noise of the system is not limited by the correlator performance.

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