Digilent Introduces an FPGA-based signal processing system

Signal processing applications require high computing performance and power efficiency. Digilent Eclypse Z7 Ecosystem can provide the solution to the signal processing applications. Eclypse Z7 is ideal for high-speed instrumentation, control, and measurement systems for edge-computing, medical, and communications applications.

Eclypse Z7 Ecosystem

 

Eclypse Z7 Ecosystem

The Eclypse Z7 ecosystem includes Eclypse Z7 Zynq SoC Platform, Zmod ADC 1410 and Zmod DAC 1411. Eclypse Z7 Zynq SoC Platform features high-speed Zmod ports for modular expansion and a Xilinx Zynq®-7020 SoC. The host board also includes two DDR3L memory creating a single rank, 32-bit wide interface and a total of 1 GiB of capacity.

Eclypse Z7 Host Board

The  Zmod ADC 1410 is equipped with Analog Devices AD9648, the dual channel, high speed, low power, 14-bit, 105MS/s Analog to Digital Converter (ADC). Driven by the SYZYGY carrier, the Zmod ADC can acquire two simultaneous signals (1MΩ, ±25V, single-ended, 14-bit, 100MS/s, 70MHz+ bandwidth). Analog inputs can be connected to a circuit using SMA cables. 

Zmod ADC 1410

The Zmod DAC 1411 is equipped with Analog Devices AD9717 the dual channel, high speed, low power, 14-bit, 125MS/s Digital to Analog Converter (DAC). Driven by the SYZYGY carrier, the Zmod DAC can generate two simultaneous signals (50Ω, ±5V, single-ended, 14-bit, 100MS/s, 40MHz+ bandwidth). The analog outputs can be connected to a circuit using SMA cables.

Zmod DAC 1411

FPGA-Based Signal Processing System

The ecosystem comes an application note which serves as a tutorial for the implementation of signal processing system. Apart from the Eclypse Z7 ecosystem, Analog Discovery 2, a multi-instruments test and measurement device is also used to generate analog signals and visualize output signals in the frequency domain.

FPGA Based Signal Processing Systems

The analog signals from Analog Discovery 2 are converted to digital through the Zmod ADC 1410 and then passed on to the input of a digital low pass filter. The digital low pass filter is created by Xilinx FIR compiler 7.2 IP Core. The filter's outputs are converted back to analog through the Zmod DAC 1411. These digital signals can be visualized through Zmod DAC 144 output channel 1. To correct the phase errors, there is a digital loopback by connecting Zmod ADC 1410 output channel directly to the Zmod DAC 1411 input channel 1.

Block Diagram for the signal processing system

 

The programmable logic of Zynq 7020 is used to:

  1. Initialize the Zmod ADC 1410 hardware and synchronize the incoming data in the user clock domain
  2. Create a digital low pass FIR filter by Xilinx FIR compiler 7.2 IP Core
  3. Initialize the Zmod DAC 1411 hardware and format the output data according to the AD9717 DAC requirements

Eclypse Z7 Software API

Petalinux is supported out of the box, and pre-built Linux images are accompanied by the API for bulk data transfer. This allows users to plug in their Zmods of choice and get started prototyping new high-speed measurement, instrumentation and control systems without directly interfacing with the FPGA until desired. Embedded Linux developers can leverage the power of FPGA without possessing hardware expertise. Currently, C and C++ are supported, with plans to add support for other programming languages in the future.


About Digilent Inc

Digilent Inc., A National Instruments Company, is set apart by the unique expertise in FPGA-based systems, test instrumentation, and even in software, with our powerful multi-instrument software application, WaveForms. We also have a robust and extensive library of documentation, reference guides, tutorials, and other rich content available for free to anyone who needs it. Digilent’s customizable and flexible solutions are accessible to advancing engineers and accelerate development and reduce the time to market for the most experienced electronic design and research professionals.



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