Patent ID: 8626469
Filing Date: 2014-01-07
Classification: H03H,H03J

Abstract:
1. A method of calibrating a filter, the method comprising: applying an input signal into the filter to generate an output signal, wherein the input signal and the output signal have a same frequency, and wherein the input signal is a first differential signal comprising a first pair of complementary signals, and the output signal is a second differential signal comprising a second pair of complementary signals; measuring a phase difference between the input signal and the output signal, wherein the measuring comprises: determining a leading/lagging status of the phase difference; calculating a capacitor code (CAP_CODE) using the leading/lagging status, wherein the leading/lagging status indicates which of the input signal and the output signal leads another one of the input signal and the output signal in phase; and calibrating the capacitor using the CAP_CODE.