An A/D Converter for High-Definition Television

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  • 高品位テレビジョン用A/Dコンバーター
  • コウ ヒンイ テレビジョンヨウ AD コンバータ -

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Description

For high-definition television (HD-TV) use, we developed an A/D converter. The basic configuration of the converter is serial-parallel in three stages. The newly developed A/D converter shows the following characteristics : -<BR>Sampling frequency 100 MHz<BR>Level resolution 8 bit/sample<BR>Input level 1 Vp-p, 75 Ohm<BR>Linearity error : less than 1/3 LSB<BR>S/NQ (quantizing noise) at input frequency of 24. 3 MHz : <BR>-4dB of theoretical value at full level input, <BR>-2dB theoretical value at-16dB of full dynamic range input.<BR>DG (differential gain) : less than 1. 5% at 30% subcarrier level, where the subcarrier frequency is 24. 3 MHz, and the sampling signal is nonlocked to the subcarrier.

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