Electronic apparatus for biological research electronicappara00dona Year: 1958 RM 1 \R2 s/?r--r; Figure attenuator with the load connected, and equate it to the generator resistance the matching conditions are met. Further, if the transmission factor of the attenuator is d, then Kin ~ VpQ ' Fin and it is not too hard to see that this equals R2(Ri + r) r R^ + R^ + r Ri' + r- R,iRr' + r) ^1 + /?2 + i?/ + r In general we know r and 6 and have to find R^ and i?2- Solving the equations we find l-d R,=r and R2 = r 1 + 6 20 1-02 A variant of the 7 attenuator which appears at first sight mor
Electronic apparatus for biological research electronicappara00dona Year: 1958 RM 1 \R2 s/?r--r; Figure attenuator with the load connected, and equate it to the generator resistance the matching conditions are met. Further, if the transmission factor of the attenuator is d, then Kin ~ VpQ ' Fin and it is not too hard to see that this equals R2(Ri + r) r R^ + R^ + r Ri' + r- R,iRr' + r) ^1 + /?2 + i?/ + r In general we know r and 6 and have to find R^ and i?2- Solving the equations we find l-d R,=r and R2 = r 1 + 6 20 1-02 A variant of the 7 attenuator which appears at first sight more complicated than it really is, is the 'balanced' or H form (Figure ). All that has been done to derive this is: (1) to take half of R^ and connect it in series with the other side of the generator; (2) to take half of R^ and connect it in series with the other side of the load. 17
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