Patent ID: 7564301

Claim:
An apparatus for adjusting frequency characteristic and Q factor of a low pass filter (LPF), comprising: a frequency comparing unit comparing a first reference value with a first square value and a second square value, wherein the first square value and the second square value are generated by integrating a first frequency band signal and a second frequency band signal; a frequency adjusting unit for adjusting the frequency characteristic of the LPF according to an output signal of the frequency comparing unit such that the first reference value falls within a range between the first square value and the second square value; a control unit for activating a Q factor comparing unit according to an output signal of the frequency adjusting unit indicating that a frequency characteristic is completely adjusted; and the Q factor comparing unit comparing a third square value with a second reference value and a third reference value according to an output signal of the control unit, wherein the third square value is generated by integrating a third frequency band signal; a Q factor adjusting unit for adjusting the Q factor of the LPF according to an output signal of the Q factor comparing unit such that the third square value falls within a range between the second reference value and the third reference value.