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:
Nov. 20, 2001
Filed:
Aug. 17, 2000
Christopher G. Arcus, San Jose, CA (US);
Pericom Semiconductor Corp., San Jose, CA (US);
Abstract
A clock generator has a duty cycle correction circuit that adjusts the duty cycle to 50%. A modulator is an inverter with extra source-limiting transistors in series to the power and ground supplies. A control voltage of about Vcc/2 is applied to the source-limiting transistors, causing them to operate in the linear region with limited current. A slow-slew output from the modulator is buffered by a driver. The driver output is filtered by a linear detector with a series resistor and input capacitor. The detector output is compared to a reference voltage of Vcc/2 by an error amp. The error amp generates the control voltage fed back to the modulator. An output capacitor creates a dominant pole with the error amp to ensure stability. A variable-threshold gate can be added between the driver output and the detector to separately adjust the measurement threshold voltage from the reference voltage to the error amp.