7.6-8.6GHz Agile Image Reject On-Chip Receiver Front-End For Adaptive X-Band Smart Skin Array Antennas

In this paper, we evaluate a new design of a previously presented agile single-chip receiver front-end intended for a digital beamforming X-band smart skin array antenna. Firstly, by using a two-stage low noise amplifier in each filter section of the tunable active filter used in the front-end, a higher filter gain and selectivity as well as a lower filter noise figure can be achieved at the expense of a smaller filter tuning range. Secondly, the 1GHz-IF double balanced mixer also utilized in the front-end has been re-optimized to achieve higher image rejection and lower conversion loss. As a result of the filter and mixer RF performance improvements achieved the re-designed front-end can exhibit at least 5085dB of image rejection, up to 13dB of conversion gain, a 6.4dB minimum value noise figure and 6065dB of spurious-free dynamic range over the 7.6-8.6GHz agile receiver bandwidth, respectively.

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