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:
Sep. 23, 2003
Filed:
Dec. 27, 2001
Lijun Tian, Shenzhen, CN;
Abstract
An integrated circuit chip includes an RC oscillator circuit. The frequency of the output signal generated by the oscillator output signal is set as a function of a value of an included internal resistor integrated on the chip. An external resistor may be connected to the chip to allow a user to manipulate the oscillator output signal frequency. A detection circuit on the chip detects the presence of the connected external resistor. Responsive to that detection, a substitution circuit operates to substitute the connected external resistor for the internal resistor in the RC oscillator circuit. This effectuates a change of the frequency of the oscillator output signal to instead be set as a function of a value of that connected external resistor.