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. 19, 2016
Filed:
Apr. 25, 2012
Yoichi Nagata, Nishitokyo, JP;
Yoichi Nagata, Nishitokyo, JP;
CITIZEN HOLDINGS CO., LTD., Tokyo, JP;
Abstract
Provided is a technology capable of preventing arithmetic operation accuracy from deteriorating even when a bipolar transistor used to form a Gilbert multiplier core has poor characteristics. A correction current generating circuit () uses a constant current source () to feed a constant current Ito an emitter of a bipolar transistor (Q7) being a first replica transistor having the same current gain α as bipolar transistors (Q1 to Q4) that form the Gilbert multiplier core (), to generate a current of α·Ion a collector side thereof. The current is output as a correction current α·I, and is added to each of one of input signals (±K1·Vy) of the Gilbert multiplier core () as a bias current, to thereby eliminate influence of the current gain α on an output signal being a multiplication result.