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General
 
 

Universal QAM demodulator

Product code: CMS0006

 
Our universal QAM Demodulator core is aimed at broadband point-to-point and point-to-multipoint applications and supports QAM orders from 2 (BPSK) to 256.
Integrates with Commsonics QAM Modulator(CMS0004), Reed-Solomon(CMS0013) and Viterbi(CMS0002) cores to form a complete broadband Modem.
Also see:

Block diagram

Universal QAM demodulator block diagram (click to enlarge)
Click on diagram to enlarge

Downloads

Universal QAM demodulator Technical data brief, 19th October 2011 (469 kB)Technical data brief, 19th October 2011 (469 kB)
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Features

  • Low demodulator implementation loss
    <0.2dB (16QAM), <0.4dB (256QAM).
  • IF sub-sampling or I/Q baseband input.
  • Wide carrier acquisition range.
  • Programmable symbol rate.
  • Large QAM support : BPSK .. QAM-256.
  • Variable ADC sampling frequency.

Applications

  • Cable downstream
    (e.g. DOCSIS, DVB-C).
  • Point-to-point terrestrial microwave
    (e.g. ETSI, FCC channels up to 56MHz).
  • Satellite up/downlink
    (e.g. DVB-S, DVB-DSNG).

Implementation

  • Single external clock source.
  • Single external analogue AGC loop.
  • All-digital timing and carrier recovery.
  • Digital channel filtering.
  • Optimised for ASIC, Xilinx and Altera.
  • Evaluation boards available.