Patent ID: 9654983
Date: 2017-05-16
CPC Classifications: H03H,H04W

Claim:
1. A tunable transmissive filter, comprising: a splitter for splitting an input signal into a first signal and a second signal; a first modifier circuit for modifying a characteristic of the first signal to produce a modified first signal; a second modifier circuit for using feedforward cancellation to modify a characteristic of the second signal to produce a modified second signal, the second modifier circuit including an N-path filter, N being an integer greater than 0, the N-path filter having a desired frequency response, wherein the N-path filter includes a first N-phase passive mixer, a baseband filter for implementing a desired filter response, and a second N-phase passive mixer, and wherein the baseband filter comprises a plurality of active baseband networks between the first and second passive mixers to realize the desired filter response; and a combiner for combining the modified first signal and the modified second signal to produce a filtered output signal having a desired inverted frequency response.