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:
Jan. 17, 1995
Filed:
Sep. 08, 1993
Hideki Miyake, Itami, JP;
Tsutomu Kamifuji, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed an amplifier circuit wherein a first differential amplifier consisting of an I/O circuit (11) and a constant-current circuit (31) and a second differential amplifier consisting of an I/O circuit (12) and a constant-current circuit (32) are connected to both first and second input terminals (1, 2), and current synthesizing circuits (21 to 24) synthesize the signals output from the first and second differential amplifiers to apply the synthesized signal to a current-to-voltage converter circuit (9), and wherein a clamp circuit (51) inhibits the operation of the first differential amplifier when the input signals at the input terminals (1, 2) are not less than (V.sub.cc -V.sub.sat), and a clamp circuit (52) inhibits the operation of the second differential amplifier when the input signals at the input terminals (1, 2) is not more than V.sub.sat. The second and first amplifiers substantially process the input signals which deviate from first and second ranges, respectively, to apply the output signal to the output terminal, thereby achieving the amplifier circuit having a wide input signal potential range.