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:
Jun. 23, 2009
Filed:
May. 31, 2007
Dipankar Bhattacharya, Macungie, PA (US);
Makeshwar Kothandaraman, Whitehall, PA (US);
John C. Kriz, Palmerton, PA (US);
Antonio M. Marques, Newark, NJ (US);
Bernard L. Morris, Emmaus, PA (US);
Dipankar Bhattacharya, Macungie, PA (US);
Makeshwar Kothandaraman, Whitehall, PA (US);
John C. Kriz, Palmerton, PA (US);
Antonio M. Marques, Newark, NJ (US);
Bernard L. Morris, Emmaus, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A compensation circuit for compensating an output impedance of at least a first MOS device over PVT variations to which the first MOS device may be subjected includes a first current source generating a first current having a value which is substantially constant and a second current source generating a second current having a value which is programmable as a function of at least one control signal presented to the second current source. A comparator is connected to respective outputs of the first and second current sources and is operative to measure a difference between the respective values of the first and second currents and to generate an output signal indicative of relative magnitudes of the first current and the second current. A processor connected in a feedback arrangement between the comparator and the second current source receives the output signal generated by the comparator and generates the control signal for controlling the second current as a function of the output signal. The processor is operative to control the value of the second current so that the second current is substantially equal to the first current.