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:
Aug. 20, 2019
Filed:
May. 02, 2017
Fairchild Semiconductor Corporation, Sunnyvale, CA (US);
Hua Zhu, Austin, TX (US);
Kaiwei Yao, San Jose, CA (US);
FAIRCHILD SEMICONDUCTOR CORPORATION, Phoenix, AZ (US);
Abstract
A ramp generator includes a current generator, a current mirror, and a first capacitor. The current generator has an input for receiving a clock signal, and an output for providing a current proportional to a frequency of the clock signal using a first transistor having first and second current electrodes and a control electrode, an amplifier that establishes a reference voltage on the second current electrode of the first transistor, and a variable resistor coupled between the second current electrode of the second transistor and ground whose resistance is set according to the frequency of the clock signal. The current mirror has an input coupled to the first terminal of the first transistor, and a second terminal. The first capacitor has a first terminal coupled to the output of the current mirror and providing a ramp signal, and a second terminal coupled to the first power supply voltage terminal.