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. 25, 1995
Filed:
Feb. 14, 1994
Applicant:
Inventors:
Mathew A Rybicki, Austin, TX (US);
Kelvin E McCollough, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330-9 ; 330 51 ;
Abstract
The present invention provides a circuit (10) and method for sampling a single-ended signal and then converting the single-ended signal to a differential signal. After the single-ended signal is converted to a differential signal, then the offset voltage and low frequency noise of an operational amplifier (38) are subtracted from the differential signal using analog techniques. The subtraction operation effectively removes an operational amplifier's offset voltage and a low frequency noise from being a source of error in the differential output signal of the circuit.