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:
Dec. 07, 1982
Filed:
Jan. 31, 1979
Kazuo Watanabe, Kokubunji, JP;
Masanori Ienaka, Kodaira, JP;
Yasuo Kominami, Kokubunji, JP;
Makoto Homma, Hamura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An FM detector is constructed of a phase shift network and an analog multiplier. The analog multiplier includes a differential amplifier circuit and a phase detector circuit. The differential amplifier circuit includes differential pair transistors which are driven by FM intermediate frequency signals. One of the differential pair transistors has another transistor connected thereto which is also driven by the FM intermediate frequency signal. A collector signal of either one of the differential pair transistors is applied to the phase detector circuit through the phase shift network, while a collector signal of the other transistor is directly applied to the phase detector circuit. An emitter of the one transistor and an emitter of the other transistor are connected through resistors, whereby the signal-to-noise ratio of the FM detector is improved.