An A/D Converter for High-Definition Television

Abstract

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 : -
Sampling frequency 100 MHz
Level resolution 8 bit/sample
Input level 1 V_p-p, 75 Ohm
Linearity error : less than 1/3 LSB
S/N_Q (quantizing noise) at input frequency of 24. 3 MHz :
-4dB of theoretical value at full level input,
-2dB theoretical value at-16dB of full dynamic range input.
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.