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:
Jan. 28, 2014
Filed:
Jan. 18, 2012
Chieh-min Lo, Zhunan Township, Miaoli County, TW;
Tzu-huan Chiu, Taichung, TW;
Chien-sheng Chen, Toufen Township, Miaoli County, TW;
Chien-ping LU, Tainan, TW;
Chieh-Min Lo, Zhunan Township, Miaoli County, TW;
Tzu-Huan Chiu, Taichung, TW;
Chien-Sheng Chen, Toufen Township, Miaoli County, TW;
Chien-Ping Lu, Tainan, TW;
Richtek Technology Corporation, R.O.C., Chupei, Hsin-Chu, TW;
Abstract
The present invention discloses a rail-to-rail comparator. The rail-to-rail comparator includes: a positive voltage rail providing a positive supply voltage, a ground voltage rail providing a ground voltage, an input stage, and an output stage. The input stage includes: a positive and a negative input terminals for receiving a first input signal and a second input signal; a first differential amplifier circuit, which includes a pair of depletion NMOS transistors to generate a first pair of differential currents; and a second differential amplifier circuit, which includes a pair of native NMOS transistors to generate a second pair of differential currents. The output stage is coupled to the first differential amplifier circuit and the second differential amplifier circuit, and generates an output signal related to a difference between the first input signal and the second input signal.