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:
Nov. 26, 2013
Filed:
Jun. 19, 2012
Kimikazu Sano, Kanagawa, JP;
Hiroyuki Fukuyama, Kanagawa, JP;
Hideyuki Nosaka, Kanagawa, JP;
Makoto Nakamura, Kanagawa, JP;
Koichi Murata, Kanagawa, JP;
Masatoshi Tobayashi, Kanagawa, JP;
Yasunobu Inabe, Kanagawa, JP;
Eisuke Tsuchiya, Kanagawa, JP;
Kimikazu Sano, Kanagawa, JP;
Hiroyuki Fukuyama, Kanagawa, JP;
Hideyuki Nosaka, Kanagawa, JP;
Makoto Nakamura, Kanagawa, JP;
Koichi Murata, Kanagawa, JP;
Masatoshi Tobayashi, Kanagawa, JP;
Yasunobu Inabe, Kanagawa, JP;
Eisuke Tsuchiya, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
NTT Electronics Corporation, Kanagawa, JP;
Abstract
In an automatic gain control circuit, a peak detection circuit detects and outputs the peak voltage of an output signal from a variable gain circuit. An average value detection/output amplitude setting circuit detects the average value voltage of an output signal from the variable gain circuit, and outputs a calculated voltage. An amplification circuit controls the gain of the variable gain circuit by amplifying the difference between the output voltages of the peak detection circuit and average value detection/output amplitude setting circuit. The number of base-emitter junctions of transistors on a path in the peak detection circuit from input ports which receive output signals from the variable gain circuit to an output port which outputs a voltage to the amplification circuit is equal to the number of base-emitter junctions of transistors on a path in the average value detection/output amplitude setting circuit.