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:
Apr. 23, 2002
Filed:
Apr. 30, 1999
Woogeun Rhee, Irvine, CA (US);
Akbar Ali, Garden Grove, CA (US);
Conexant Systems, Inc., Newport Beach, CA (US);
Abstract
An oscillator has a slope-fixing circuit that generates a control signal and fixes the slope of the control signal, a swing-fixing circuit that fixes the swing of the control signal, and a switching block that generates an output signal having a frequency derived from the swing and the slope of the control signal. The slope-fixing circuit comprises a fixed timing capacitor C in parallel with a plurality of switchable timing capacitors C . . . C to provide an effective capacitance C. The slope of the control signal is determined by the ratio of a control current I to the effective capacitance C. The swing-fixing circuit comprises a replica cell that accepts a programmable reference voltage V and provides a fixed voltage swing V =V −V across a pair of load transistors. The switching block comprises a pair of switching transistors that alternate between “on” and “off” states depending on the value of the control signal to produce an oscillating output signal. The frequency of the output signal is given by