FPGA-based wideband digital down-converter IP core
Signals with bandwidths as high as 180 MHz can be down-converted to complex baseband (I/Q) from anywhere within the chosen input Nyquist band, within the limits imposed by the signal bandwidth. The down-conversion frequency is tuneable over the entire 1.8 GHz range, with an accuracy of better than 1 Hz, enabling, for example, the total removal of intermediate frequency (IF) components. The extracted signal bandwidth is precisely selectable in the range 800 Hz to 180 MHz. This is provided through user control of the output sample rate, which may be programmed in the range 1 kS/s to 225 MS/s with an accuracy of better than 1 S/s.
High performance filtering provides a spurious free dynamic range (SFDR) of at least 80 dB, with a passband peak-to-peak ripple of less than 0.1 dB.
User control of the down-conversion frequency and output sample rate, makes the core eminently suitable for software defined radio (SDR), electronic warfare (EW), signal surveillance and generic digital receiver applications.
The Wideband DDC complements the company’s range of "channeliser" designs that provide flexible down-conversion for single and multiple channel applications.
Alex Kuhrt, RFEL’s CEO added, "The ability to down-convert a signal, from a bandwidth as high as 1.8 GHz, makes the Wideband DDC an obvious choice for communications, electronic warfare and surveillance applications. We use the latest Xilinx and Altera FPGA technology, so that solutions can be made compact, lightweight and low power. Furthermore, the use of a flexible architecture makes the product easily configurable to the customer’s specific needs."
The Wideband DDC is being launched at MILCOM in Baltimore, USA, this week. Special configurations, such as those supporting multiple inputs, are available on request.
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