The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1995
Filed:
Mar. 04, 1993
Applicant:
Inventors:
Tatsuji Matsuura, Tokyo, JP;
Imaizumi Eiki, Tokyo, JP;
Kunihiko Usui, Asaka, JP;
Takanobu Anbo, Fuchu, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi VLSI Engineering Corp., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341162 ; 341161 ; 341156 ;
Abstract
A high speed, accurate AD converter operable at low supply voltage, even with low gain amplifiers, particularly for a serial-parallel or pipelined AD converter, has a sub AD converter in each block of the second and subsequent stages provided with an adjuster for adjusting the full scale reference voltage in accordance with the gain of the error amplifier of the preceding stage. Analog switches are rendered immune to low operating voltage by being supplied separate voltage higher than the supply voltage of the other components in their circuit.