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:
Oct. 06, 1998
Filed:
Jul. 01, 1996
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An operational amplifier with improved operational speed, as well as low power consumption, arranges a current mirror made of the pMOS transistors PT.sub.17 and PT.sub.18 in the stage after the initial-stage differential amplifier, supplies the output of the initial-stage differential amplifier to the gate of the nMOS transistor NT.sub.14, supplies the current flowing through the current mirror to the output stage side by a current mirror made of the pMOS transistors PT.sub.15 and PT.sub.16, and lastly a pMOS transistor PT.sub.19 is connected as a constant-current source between the supply line for the power supply voltage V.sub.DD and the node ND.sub.12, and makes the idling current I.sub.19 flow in the node ND.sub.12. Due to this, stabilization of DC operations during normal states and when shifting its states can be designed without considering the characteristics in the vicinity of the threshold voltage of pMOS transistor PT.sub.16, and thus stringent controls in the manufacturing process and the like are unnecessary.