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:
May. 06, 2008
Filed:
Dec. 20, 2001
Hiroshi Miyagi, Jouetsu, JP;
Hiroshi Miyagi, Jouetsu, JP;
Niigata Seimitsu Co., Ltd., Niigata, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A limit circuit capable of providing high gain. The limit circuit included in an FM receiver comprises, for example, seven amplifiers (to), and a BPF () inserted substantially in the middle thereof. Each of the amplifiers (to) operates as a differential amplifier, and has a gain of about 13 dB. The BPF () serving as a limit circuit passes components in a bandwidth wider than the bandwidth of the signal to be amplified. The level of 1/f noise and heat noise can be reduced by eliminating low-frequency components and high-frequency components of the Signal amplified by the four amplifiers (to), respectively. Therefore, each of the amplifiers (to) connected to the rear end of the BPF () is not animated by the noise component.