Patent ID: 9191127
Filing Date: 2015-11-17
Classification: H03H,H04B,H04W

Abstract:
1. A signal filter comprising: a first transferred impedance filter, TIF, having first, second, third and fourth first-TIF differential signal paths; a second TIF having first, second, third and fourth second-TIF differential signal paths; a first differential signal input port of the first TIF coupled in parallel to a first differential signal input port of the second TIF; a first clock generator arranged to provide first-TIF first, second, third and fourth clock signals having non-overlapping phases for respectively selecting the first, second, third and fourth first-TIF differential signal paths via eight switch elements of the first TIF; and a second clock generator arranged to provide second-TIF first, second, third and fourth clock signals having non-overlapping phases for respectively selecting the first, second, third and fourth second-TIF differential signal paths via eight switch elements of the second TIF; wherein the phases of the second-TIF first, second, third and fourth clock signals are respectively equal to the phases of the first-TIF first, second, third and fourth clock signals delayed by 45 degrees; and wherein the first-TIF first, second, third and fourth clock signals and the second-TIF first, second, third and fourth clock signals each have a duty cycle in the range of 16.75% to 25%.