Search International and National Patent Collections
|1. (WO2014207300) METHODS AND APPARATUS FOR SIGNAL FILTERING|
|Applicants:||NOKIA TECHNOLOGIES OY
|Title:||METHODS AND APPARATUS FOR SIGNAL FILTERING|
A plurality of tunable cross-coupled resonators (1-5) are connected using capacitive coupling elements (212, 214, 216, 218) to form a cross-coupled bandpass filter (200). A center frequency of the filter (200) may be set based on frequencies of the resonators (1-5) and a fractional bandwidth of the filter may be set based on states of the capacitive coupling elements (212, 214, 216, 218). Programmable zeroes of the filter (200) may be set based on states of reactive elements (228, 230) coupling selected pairs of the resonators. The reactive elements may be capacitive, for zeroes below the center frequency, or inductive, for zeroes above the center frequency.