[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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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.

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The pyroelectric vidicon is an infrared sensitive camera tube which has a pyroelectric target that is electronically scanned for infrared thermal imaging. The target operates at ambient temperature and does not need any cooling system.
Some problems, for example signal to noise ratio, flicker, thermal diffusion, on pyroelectric vidicon applications are explored. Several signal processing for advancement of pyroelectric vidicon are described.

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