Patent number: 9191127
Abstract: A signal filter (100) comprises a first transferred impedance filter, TIF, (TIFA) having four differential signal paths (PA,1, PA,2, PA,3, PA,4) and a second TIF (TIFB) having four differential signal paths (PB,1, PB,2, PB,3, PB,4)- A first differential signal port of the first TIF (32A) is coupled to a first differential signal port of the second TIF (32B). A first clock generator (12A) is arranged to provide first-TIF clock signals (CLKA,I+, CLKA,Q+, CLKA,I?, CLKA,Q?) having four non-overlapping phases for selecting the respective first-TIF differential signal paths (PA,1, PA,2, PA,3, PA,4), and a second clock generator (12B) is arranged to provide second-TIF clock signals (CLKB,I+, CLKB,Q+, CLKB,J?, CLKB,Q?) having four non-overlapping phases for selecting the respective second-TIF differential signal paths (PB,1, PB,2, PB,3, PB,4).
Type:
Grant
Filed:
December 20, 2012
Date of Patent:
November 17, 2015
Assignee:
ST-ERICSSON SA
Inventor:
Kimmo Koli
Publication number: 20150016492
Abstract: A signal filter (100) comprises a first transferred impedance filter, TIF, (TIFA) having four differential signal paths (PA,1, PA,2, PA,3, PA,4) and a second TIF (TIFB) having four differential signal paths (PB,1, PB,2, PB,3, PB,4)?. A first differential signal port of the first TIF (32A) is coupled to a first differential signal port of the second TIF (32B). A first clock generator (12A) is arranged to provide first-TIF clock signals (CLKA,I+, CLKA,Q+, CLKA,I?, CLKA,Q?) having four non-overlapping phases for selecting the respective first-TIF differential signal paths (PA,1, PA,2, PA,3, PA,4), and a second clock generator (12B) is arranged to provide second-TIF clock signals (CLKB,I+, CLKB,Q+, CLKB,J?, CLKB,Q?) having four non-overlapping phases for selecting the respective second-TIF differential signal paths (PB,1, PB,2, PB,3, PB,4).
Type:
Application
Filed:
December 20, 2012
Publication date:
January 15, 2015
Inventor:
Kimmo Koli