Patent ID: 8560589
Filing Date: 2013-10-15
Classification: G11B,H03H

Abstract:
1. A method for filter tuning, the method comprising: providing a tunable filter having an operation filter circuit and a calibration filter; applying a low frequency test input to the operation filter circuit in place of an input signal to yield a first filter output; calculating a low frequency magnitude value corresponding to the first filter output; applying a high frequency test input to the operation filter circuit in place of an input signal to yield a second filter output; calculating a high frequency magnitude value corresponding to the second filter output; modifying a tuning factor of the calibration filter when a ratio of the high frequency magnitude value and the low frequency magnitude value is outside of a defined range; and storing the tuning factor of the calibration filter when the ratio of the high frequency magnitude value and the low frequency magnitude value is within the defined range.