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:
Mar. 23, 2004
Filed:
Dec. 03, 2002
Sang-Chuel Lee, Anyang-si, KR;
Ad Semicon Co., Ltd., , KR;
Abstract
Disclosed is an impedance comparison integrated circuit. The integrated circuit includes a current mirror part, a discharging part, a differential amplification part and a first output part. The current mirror part provides current to a first and second input terminal, respectively, during a first interval of every period. The discharging part provides a discharging path to the first and second input terminals, respectively, during a second interval of every period. The differential amplification part performs a differential amplification on signals input from the first and second input terminals, respectively, during the first interval of every period. The first output part outputs a first output signal to the first output terminal in response to the differential amplification part. Accordingly, parasitic impedance difference between each parasitic impedance of the first and second input terminals is minimized, and input offset error is reduced, so that impedance sensing with high precision is possible.