G - Physics – 05 – F
Patent
G - Physics
05
F
G05F 5/00 (2006.01) H03F 1/08 (2006.01) H03F 1/10 (2006.01)
Patent
CA 2703361
In various embodiments, applicants' teachings are related to an active guarding circuit and method for reducing parasitic impedance signal loading on a signal-transmission channel that is shunted by a parasitic impedance. The presence of an electrical signal on the signal-transmission channel causes a leakage current to flow through the parasitic impedance. In various embodiments, the circuit comprises an amplifier and an impedance, one terminal of the impedance is coupled to the signal-transmission channel. The input of the amplifier is coupled to the signal-transmission channel and the output is coupled to the other terminal of the impedance so as to cause a compensation current to flow through the impedance. The gain of the amplifier and the value of the impedance are selected so that the compensation current has a magnitude substantially equal to the leakage current magnitude.
Dans divers modes de réalisation, les enseignements des demandeurs concernent un circuit de protection actif et un procédé permettant de réduire la charge de signal d'impédance parasite sur un canal de transmission de signaux shunté par une impédance parasite. La présence d'un signal électrique sur le canal de transmission de signaux oblige un courant de fuite à traverser l'impédance parasite. Dans divers modes de réalisation, le circuit comprend un amplificateur et une impédance. Une borne de cette impédance est couplée au canal de transmission de signaux. L'entrée de l'amplificateur est couplée au canal de transmission de signaux, et sa sortie est couplée à l'autre borne de l'impédance afin d'obliger un courant de compensation à traverser l'impédance. Le gain de l'amplificateur et la valeur de l'impédance sont sélectionnés de sorte que l'amplitude du courant de compensation soit pratiquement égale à celle du courant de fuite.
Altmejd Morrie
Fan Chung Shing
Ironstone Joel
Smith Kenneth Carless
Wang David
Impedimed Limited
Oyen Wiggs Green & Mutala Llp
LandOfFree
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