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:
Apr. 22, 2003
Filed:
Feb. 26, 1999
Hisashi Kawai, Tokyo, JP;
Kokusai Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention is a frequency control and orthogonal detection circuit and a FSK receiver capable of reducing a circuit size and control of VCO appropriately. The orthogonal detection circuit and the FSK receiver of the present invention include a delay circuit, a decoder for decoding the direction of rotation, and a first integral electric discharging circuit to detect the direction of rotation of the signal point of a signal received. There is also a second delay circuit, an XOR circuit, an adder, and a second integral electric discharging circuit to detect a rotation of the signal point of a signal received. The decision circuit decides a symbol on the basis of them. The AFC circuit controls the frequency of a signal outputted by the VCO in comparison with an ideal signal outputted by the standardizing circuit.