Patent ID: 6914437

Claim:
A method for calibrating a receiver low pass filter, the method comprises: setting filter response of the receiver low pass filter to an initial state; filtering, by the receiver low pass filter, a first signal having a first frequency to produce a first filtered signal by: setting a transmit power level of a transmitter section to a nominal calibration power level; enabling a receiver section, wherein the receiver section includes the receiver low pass filter; enabling, subsequent to enabling the receiver section, the transmitter section; and transmitting, by the transmitter section at the nominal calibration power level, the first signal to the receiver section; wherein the first frequency is in a known pass region of the filter; measuring signal strength of the first filtered signal to produce a first measured signal strength, filtering, by the receiver low pass filter, a second signal having a second frequency to produce a second filtered signal, wherein the second frequency is at a desired corner frequency of the filter; measuring signal strength of the second filtered signal to produce a second measured signal strength; comparing the first measured signal strength with the second measured signal strength to determine whether the filter has attenuated the second signal by a desired attenuation value with respect to the first signal; and when the filter has not attenuated the second signal by the desired attenuation value with respect to the first signal, adjusting filter response of the receiver low pass filter to produce an adjusted filter response.