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Direct conversion receiver dev't platform targets radar apps

Posted: 18 Dec 2014     Print Version  Bookmark and Share

Keywords:Analog Devices  radar  FPGA mezzanine card  FPGA 

Analog Devices Inc. (ADI) has introduced an integrated direct conversion receiver development platform aimed at radar systems that necessitate reduced size, weight and power (SWaP) implementation. The AD-FMCOMMS6-EBZ platform is a 400MHz to 4.4GHz receiver (1350-1650MHz with installed filters) supporting the key L- and S-band frequency radar bands.

According to the company, the platform's VITA57-compliant form factor ensures seamless connectivity to FPGA mezzanine card (FMC) platforms. The AD-FMCOMMS6-EBZ is geared for defence, communications and instrumentation radar systems requiring a high level of integration and performance delivered in a compact footprint. These include early warning detection, weather surveillance and air traffic control systems.

The AD-FMCOMMS6-EBZ receiver platform integrates the AD9652 dual 16bit ADC, ADL5566 high-dynamic-range RF/IF dual differential amplifier and ADL5380 quadrature demodulator, all of which are commercial-off-the-shelf (COTS) components. A complete design support package is available for the AD-FMCOMMS6-EBZ, and includes schematics, layout files, noise analysis worksheet, FPGA HDL (hardware description language) code and software drivers.

AD-FMCOMMS6-EBZ

The AD-FMCOMMS6-EBZ uses an I/Q demodulator to implement a direct conversion or zero IF architecture in which just one frequency translation is required, compared to a super-heterodyne receiver that must perform several frequency translations. A single frequency translation is advantageous because it reduces receiver complexity and the number of conversion stages needed, which in turn increases performance and reduces power consumption. The architecture also avoids image rejection issues and unwanted mixing by adding an amplification stage to maintain the full-scale input to the ADC. In addition, the image rejection inherent to the I/Q modulation scheme removes the need for an expensive anti-aliasing filter. The on-board local oscillator and converter clock share the same reference signal to prevent smearing.

The AD-FMCOMMS6-EBZ receiver development platform incorporates a full direct-receive signal chain path and has a bandwidth of 220MHz with a pass-band flatness of ±1dB. The RF input range of the ADL5380 demodulator is 400MHz to 6GHz and is powered by a single 5V supply. The ADL5566 4.5GHz dual differential amplifier is optimised for IF and DC applications and provides a gain of 16dB. The AD9652 dual 16bit, 310MSPS ADC achieves the industry's lowest noise at the highest speed; this level of performance enables target identification at a much longer range. The SNR and SFDR measured at an IF of 145MHz are 64dB and 78dBc, respectively. Additional on-board functionality includes power management and clock distribution with fanout.

The AD-FMCOMMS6-EBZ is available in FMC package for $650.





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