The Medicina IRA-SKA Engineering Group

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At the preparation time of this paper, the Beamformer / correlators designa have not faced yet. May be that a FFT beamformer [4] will result more suitable in our case. The continuous increasing of computation power and the decreasing cost of the modern DSP, the plan to investigate the possible use of these devices represents a good starting point for near future discussions and developments within an international cooperation. 30
6.0 Upgrade Technological Activities In the first 6 months of upgrade activities (SKA consortium oriented), a low-cost high-performance front end and a very low-cost high-dynamic-range second stage have been developed. Two receiver versions are considered: the first one equipped with a Vector Modulator (for tile or antenna macroelement formation at the RF level) and the second one without Vector Modulator (single receiver solution). The receiver basic block diagram (with VM) is visible in Figure 6.1. The final version could be composed by 3 amplifier stages as reported at the end of this paragraph. Figure 6.1: Schematic block diagram of the front end. The Front End is composed by several stages: The first stage (LNA): Since its detailed description will be the subject of future reports, we give here a brief summary of the main measured characteristics. In Figure 6.2 and 6.3 the electrical diagram and the prototype layout are visible. - Tsys= 29 K, - OIP3 =+24.5 dBm - Cost 12 Euro (connectors not included) - Single power supply 31
Page 1 and 2: The Medicina IRA-SKA Engineering Gr
Page 3 and 4: 1.0 Introduction. The Northern Cros
Page 5 and 6: Figure 1.2: An artistic black and w
Page 7 and 8: Figure 2.1: Overall view of the N/S
Page 9 and 10: At present each 128 dipoles are sum
Page 11: Figure 3.0: Fully digital beamformi
Page 14 and 15: 4.0 NORTHERN CROSS UPGRADE PLAN We
Page 16 and 17: Figure 4.3: Pictorial view of the c
Page 18 and 19: the IF frequency value (30 MHz, BW=
Page 20 and 21: It can be noted in this table that
Page 22 and 23: Figure 4.13: Total beam on the tran
Page 24 and 25: Figure 4.16 : Block diagram of the
Page 26 and 27: 4.3.2 FOV of the E/W in the differe
Page 28 and 29: E/W: 1- 24 receivers (24-1) = 23 2-
Page 32 and 33: Figura 6.2: Electrical diagram of t
Page 34 and 35: Figure 6.5: Measured S11 and S21 of
Page 36 and 37: Figure 6.9 : Second stage layout sk
Page 38 and 39: First Test: In order to test qualit
Page 40 and 41: Figure 6.16: Filter evaluation test
Page 42 and 43: The Vector Modulator At present the
Page 44 and 45: - The digitiser - First test of tra
Page 46 and 47: labs gives a cost of about 100 Euro
Page 48 and 49: 9.0 Time Schedule Since at present

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