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DVB-T modulator

Product code: CMS0009

The proliferation of low-cost DVB-T / DVB-H demodulation and set-top-box products has opened up a wealth of opportunities for applications requiring low-cost broadband wireless audio/video/data links using DVB-T modulator technology. Commodity products have largely been aimed at the broadcast market where the high volumes are at the demodulation end of the link. The Commsonic DVB-T Modulator allows exploitation of this technology by allowing the development of the DVB-T modulator in low-cost FPGA or ASIC implementation. Applications include CCTV, wireless home networking, test equipment, etc.
This core is intended to provide a very efficient FPGA or ASIC implementation of all functions required to take the output from an MPEG-2 transport multiplexer and modulate it according to the DVB-T ETSI EN300 744 v1.5.1. The specification is fully supported by the DVB-T modulator for 2K, 4K and 8K COFDM modes as well as hierarchical transport streams. The standard output is a baseband I/Q digital pair for direct connection to a DAC. Alternative output configurations include a low IF or direct connection to standard Analog Devices Direct Digital Synthesizers (e.g. AD9857).
Every effort has been made to keep the size of the DVB-T modulator to an absolute minimum in order to target the low-cost FPGA families, however this has not been at the expense of functionality. Synthesis directives are used wherever possible to remove blocks within the design which contain functionality not required for all applications.


DVB-T modulator DVB-T Standard
DVB-T modulator DVB-H Standard

Block diagram

DVB-T modulator block diagram (click to enlarge)
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Safari Plug-in

DVB-T modulator safari plug-in (click to enlarge)
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Standards compliance

  • ETSI EN300 744 v1.5.1


  • RS and convolutional encoding.
  • Native and indepth interleaving.
  • QPSK, QAM-16 and QAM-64 support.
  • Hierarchical support.
  • 2k,4k and 8k FFT.
  • FFT guard interval insertion.
  • Optional FFT output windowing.
  • Optional critical-mask output filter.
  • Optional noise source.
  • Variable 5-8MHz bandwidth interpolation.
  • External AD9857/AD9957 DDS interface.
  • Automatic AD9857/AD9957 programming.
  • Multi-channel AD9857/AD9957 applications.
  • External AD9789 RF DAC interface.
  • Automatic AD9789 programming.
  • Optional AD9516/ADF4350 PLL programming.
  • Optional internal IF conversion.
  • Optional in-band equalisation.


Plug-ins / Extensions