. Electronic apparatus for biological research . -f- log frequency c o "^ l_ .11 o ^â ^ log frequency Figure r o l/l '^o ' Er, «' m c-<- ra I. 1â log frequency Input If f â¢Output Figure characteristic here is given by an acceptor of the negative feedback type, one having another parallel Tin the feedback loop {Figure ). The characteristic of the parallel T is given by 1/(1 â Ajo) where a = CO (JO, and a)â = CR COg CO as we have seen. Further, the characteristic of the acceptor amplifier is given, as we have also seen, by A 1 + A 1 1 - 4ja 206

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