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:
Feb. 11, 2003
Filed:
Sep. 28, 2001
Cornel D. Stanescu, Bucharest, RO;
Radu H. Iacob, Santa Clara, CA (US);
Catalyst Semiconductor, Inc., Sunnyvale, CA (US);
Abstract
A low dropout voltage regulator with non-Miller frequency compensation is provided. The LDO circuit has two wide-band, low-power cascaded operational transconductance amplifiers (OTAs): an error amplifier and a unity-gain-configured voltage follower. The unity-gain-configured voltage follower drives a gate of a power PMOS path transistor with a high parasitic gate capacitance. The wide-band, low-power OTAs enable the use of a single, low-value load capacitor with a low equivalent series resistance (ESR). A frequency compensation capacitor is connected in parallel with the upper resistor of a feedback network, which introduces a zero-pole pair that enhances the phase margin close to unity-loop-gain frequency.