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. 18, 1999
Filed:
Jul. 25, 1996
Yukio Suzuki, Tsurugashima, JP;
Toko Kabushiki Kaisha, Tokyo-to, JP;
Abstract
A therefor method of manufacturing tuning circuits for constituting a high frequency channel selecting circuit for a radio receiver. The method can eliminate the complicated coil inductance adjustment for tracking on the circuit board, so that the circuit elements can be arranged freely without any interference between the tuning circuits. The variable capacitance diodes (D1, D2; D3, D4; D5, D6) and fixed capacitances (C1; C4; C7) are classified; a fixed capacitance is selected according to a ranking of capacitance value of the variable capacitance diodes, to obtain a variable capacitance range or a ratio (C.sub.max /C.sub.min) determined for each tuning circuit; and the inductance of a coil (L1; L2; L3) of each tuning circuit is adjusted in such a way that tracking error can be eliminated on the basis of one common tuning voltage, before the tuning circuits are mounted on the circuit board.