Monolithic clockless-A/D-converter integrated circuits

New circuit arrays and systems of MOS-type monolithic clockless-A/D-converter integrated circuit have been proposed. A fabricated 5-bit monolithic clockless-A/D converter was composed of the self-scanning part associated with the continuously variable threshold voltage device (CVTD), the logic circuit part associated with the AND-GATE circuit and inverter circuit and the decoder part. The minimum converting time and the resolution accuracy for 1 bit were about 2 µs and 3.1 percent, Furthermore, the circuit system and the array, the device structure, and the electrical characteristics are discussed in details.