Reconfigurable filter

摘要

A reconfigurable filter includes a splitter for providing an input signal on a plurality of paths. A first path includes a first filter section that can be configured as either a tunable band pass filter with a shunt-connected fixed inductor or a tunable notch filter with a fixed inductor in parallel with a tunable varactor, either of which can be responsive to a control signal. A second path is an all pass section that provides an unfiltered signal. A combiner is provided for combining the first filtered signal with the unfiltered signal for producing a composite signal. The unfiltered signal can have its gain or phase modified in either or both the splitter or the combiner.

主权项

1. A reconfigurable filter comprising:
a splitter for receiving an input signal and dividing the input signal into a plurality of signals and respectively providing the plurality of signals to a corresponding path of a plurality of paths; a first filter section connected to a first path of the plurality of paths for providing a first filtered signal, wherein the first filter section is operably responsive to a first control signal to change a frequency response of the first filter section, wherein the first filter section is a tunable band pass filter responsive to the first control signal; an all pass section connected in parallel with the first filter section and connected to a second path of the plurality of paths for providing an unfiltered signal; a second filter section connected to a third path of the plurality of paths for providing a second filter signal, wherein the second filter section is operably responsive to a second control signal to change a frequency response of the second filter section, wherein the second filter section is a tunable notch filter; and a combiner for combining the first filtered signal, the second filter signal, and the unfiltered signal for producing a composite filtered signal.