H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 1/32 (2006.01) H03C 1/06 (2006.01) H03D 1/02 (2006.01) H03F 3/18 (2006.01) H03K 5/01 (2006.01) H04B 1/12 (2006.01) H04B 1/38 (2006.01) H04B 15/06 (2006.01)
Patent
CA 2566491
A CMOS transconductor for cancelling third-order intermodulation is provided. The transconductor includes a transconductance circuit and a tuneable distortion circuit. The transconductance circuit takes an input voltage and generates an output current having a transconductance element and an IM3 element. The distortion circuit takes the same input voltage and generates a current having an IM3 element of equal amplitude and opposite phase to the IM3 element of the transconductance circuit. A controller circuit tunes the distortion circuit to adjust its IM3 element to substantially equal the amplitude of the IM3 of the transconductance circuit. The distortion and transconductance circuits are arranged to sum their output currents thereby effectively cancelling the IM3 elements, leaving the transconductance relatively unmodified.
L'invention porte sur un transducteur CMOS servant à annuler une intermodulation de troisième ordre. Ce transducteur comprend un circuit de transconductance et un circuit de distorsion accordable. Ce circuit de transconductance prend une tension d'entrée et génère un courant de sortie possédant un élément de transconductance et un élément IM3. Le circuit de distorsion prend la même tension d'entrée et génère un courant possédant un élément IM3 d'amplitude égale et de phase opposée à l'élément IM3 du circuit de transconductance. Un circuit de commande accorde le circuit de distorsion afin de régler son élément IM3 de manière à égaliser sensiblement l'amplitude de l'IM3 du circuit de transconductance. Les circuits de distorsion et de transconductance sont conçus pour totaliser leurs courants de sortie, ce qui permet d'annuler efficacement les éléments IM3, laissant ainsi la transconductance presque identique.
Borden Ladner Gervais Llp
Icera Canada Ulc
Sirific Wireless Corporation
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