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:
Jul. 02, 1996
Filed:
Jun. 01, 1995
Applicant:
Inventors:
Tsutomu Ieki, Nagaokakyo, JP;
Yasuhiko Hirano, Nagaokakyo, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
332102 ; 3311 / ; 331179 ; 375272 ; 375306 ;
Abstract
An FSK modulator including an amplifier for oscillation has a surface acoustic wave resonator connected in series with a switching circuit formed without a variable-capacity diode but including a semiconductor switch and one or more fixed-capacity capacitors. When an input signal is received, the switch causes a capacitor or combination of capacitors to become connected in series with the surface acoustic wave resonator, providing oscillations with two frequencies to effect FSK modulation.