Baseband filter calibration methods and systems

摘要

Devices and methods capable of correcting for distortion are disclosed. For example, a method for compensating for non-idealities in a frequency-conversion circuit having a high-frequency input side separated from a baseband side by a passive mixer is presented. The method includes injecting a plurality of calibration signals in the baseband side to determine cross-talk between an In-phase (I) portion of the baseband side and a Quadrature (Q) portion of the baseband side to produce a first measurement Γ+ and a second measurement Γ−, synthesizing a crosstalk compensation filter g(ω) based on the first measurement Γ+ and the second measurement Γ−, and applying the crosstalk compensation filter g(ω) to an output of the frequency-conversion circuit.

主权项

1. A method for crosstalk compensating for non-idealities in a frequency-conversion circuit for separating a high input frequency from a baseband frequency by passive mixers coupled to a respective baseband filter, the method comprising:
injecting a plurality of calibration signals from a processor coupled to outputs of the respective baseband tiller to produce a first measurement and a second measurement at the outputs respectively; synthesizing a crosstalk compensation filter g(ω) and a correction filter h(ω) based on the first measurement and the second measurement; and applying the correction filter h(ω) to an output of the frequency-conversion circuit.