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. 11, 2006
Filed:
Apr. 30, 2004
Chad E. Mitchell, Kasson, MN (US);
Vicki L. Pipal, Rochester, MN (US);
Joey M. Poss, Rochester, MN (US);
Raymond A. Richetta, Rochester, MN (US);
Chad E. Mitchell, Kasson, MN (US);
Vicki L. Pipal, Rochester, MN (US);
Joey M. Poss, Rochester, MN (US);
Raymond A. Richetta, Rochester, MN (US);
Abstract
An apparatus for providing head amplitude characterization using gain loops is disclosed. A variable gain amplifier (VGA) receiving input signals and generates a VGA output signal. A digital-to-analog converter (DAC) circuit provides a desired input signal to the VGA and a gain control loop drives the VGA to gain lock the VGA to the provided desired input signal. An analog-to-digital converter (ADC) provides a digital output representing an ADC code spread in response to the VGA output. A controller drives the DAC to provide the desired input signal to the VGA and generates control signals for controlling the ADC, the controller further determines read head channel amplitude based upon the signal provided to the DAC, the ADC code spread received from the ADC and gain code provided by the gain control loops.