Yamaji Takafumi    Department   SOJO UNIVERSITY  Department of Computer and Information Sciences, FACULTY OF COMPUTER AND INFORMATIONSCIENCES      /(DC)Division of Applied Information Sciences, Graduate School of Engineering      /Division of Applied Information Sciences, Graduate School of Engineering    Position
Country of acquisition	Foreign country (米国)
Patent No.	USP 5,841,388
Date of Grant	1998/11/24
Inventor	Yasuda; Akira (Kawasaki, JP), Itakura; Tetsuro (Tokyo, JP), Yamaji; Takafumi (Ichikawa, JP)
Patent Title	A/D converter apparatus with frequency conversion function and radio apparatus using the same
Details	An A/D converter apparatus comprising a negative feedback loop having a main signal line supplied with an input signal of a predetermined frequency and a feedback signal line passing through a feedback signal, a A/D converter connected to the main signal line for frequency-converting the input signal to a signal having a frequency different from that of the input signal to output a converted signal, a D/A converter connected to the feedback signal line for frequency-converting the feedback signal to a signal having a frequency substantially equal to that of the input signal, and a subtracter for subtracting the feedback signal from the D/A converter from the input signal to supply a subtraction result signal to the A/D converter.