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. 10, 1985
Filed:
Feb. 08, 1984
Kazuo Yamagiwa, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
There is provided a sum or differential frequency signal generating circuit for two input signals of first and second frequencies. This circuit comprises: 1st and 2nd differential amplifiers which receive the input signal of the 1st frequency and generate differential 1st and 2nd output currents having the phase difference of 90.degree.; 3rd and 4th differential amplifiers which receive the input signal of the 2nd frequency and generate differential 3rd and 4th output currents having the phase difference of 90.degree.; a 1st multiplier consisting of a differential amplifier for generating the multiplication output current of the output currents of the 1st and 3rd differential amplifiers; a 2nd multiplier consisting of a differential amplifier for generating the multiplication output current of the output currents of the 2nd and 4th differential amplifiers; and an output terminal at which the output currents of the 1st and 2nd multipliers are synthesized and fetched. This signal generating circuit hardly needs adjusting circuit but can suppress unnecessary signal components and is suitable for making an IC and can be applied to an SSB modulator and other similar circuits.