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. 11, 2003
Filed:
Dec. 18, 2001
Ahmed N. Mohieldin, College Station, TX (US);
Abdellatif Bellaouar, Dallas, TX (US);
Sherif Embabi, Plano, TX (US);
Michel Frechette, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An integrated circuit (ICT) comprising a filter ( ). The filter comprises an input (&ugr; +) for receiving an input signal and an output ( ) for producing an output signal having a frequency cutoff point. The filter further comprises at least one resistor network (RN ) coupled between the input and the output. The resistor network comprises a first non-switched resistance (R ) and a first resistance series connection connected in parallel with the first non-switched resistance. The first resistance series connection comprises a switched resistance (R ) connected in series with a source/drain path of a switching transistor (TRR ), the switching transistor having a gate for receiving a control signal. The frequency cutoff point is adjustable in response to the control signal. Additionally, the switched resistance has a first resistance and the switching transistor has an on-resistance. Further, the on-resistance is at least 20 percent of the total of the first resistance and the on-resistance.