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IP Core Products > Cable > DVB-C J83 demodulator |
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| Product code: CMS0022 |
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The CMS0022 Cable (QAM) Demodulator is fully compliant with the European, US
and Japanese downlink cable Standards DVB-C EN 300 429 and ITU J83 Annexes A/B/C
(including DOCSIS 1.1/2.0). The core provides all the necessary functions
between modulated QAM input to transport stream output.
J.83B designs can operate either from internal memory (short interleaving
modes) or from shared external memory (long interleaving modes) by means of a
versatile access controller.
Typical applications of the CMS0022 include head-end video and broadband data
transmissions systems (CMTS), cable modem test equipment and point-to-point
(PTP) or point-to-multipoint microwave radio links.
A range of synthesis
options allows the core to be tailored for any particular
application. |
| Also see
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Block diagram
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Safari Plug-in
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Downloads
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Certification
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Standards compliance
DVB-C EN 300 429
ITU J83 Annexes A/B/C
DOCSIS 1.1 |
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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.
Automatic QAM mode, FEC and spectral inversion searching.
Pre-Viterbi and Pre-RS bit-error-rate statistics.
Post FEC bit-error-rate statistics. |
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Applications
ASICs for digital TV reception and cable modems.
Test and measurement equipment.
Transmodulator systems.
Point-to-point microwave transceivers. |
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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. | | |
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