. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DOUBLE-SIDED AMPLIFIERS Rj, becomes part of the load and introduces negative-feedback. We have already seen that the gain of this circuit when defined as dVjdVg is only R^ Rl + R, l+AB 2 H where A is (t^-^"^) -2-+^^ + 2 (triodes) or 2gA-^^RA (pentodes) and B is R. Rl 2 R. If ^5 ^ 1, as it usually is, this reduces to Rj]2R^. Thus if we make Rj, = Rj^, the changes of potential produced at the anodes by an in-phase input dVg are in the same direction and equal to | dVg, and the more Rj,
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DOUBLE-SIDED AMPLIFIERS Rj, becomes part of the load and introduces negative-feedback. We have already seen that the gain of this circuit when defined as dVjdVg is only R^ Rl + R, l+AB 2 H where A is (t^-^"^) -2-+^^ + 2 (triodes) or 2gA-^^RA (pentodes) and B is R. Rl 2 R. If ^5 ^ 1, as it usually is, this reduces to Rj]2R^. Thus if we make Rj, = Rj^, the changes of potential produced at the anodes by an in-phase input dVg are in the same direction and equal to | dVg, and the more Rj, is, the less the HT* f^ Input. HT* \Rl/2 h''^9m-rj2 Input 1 and2o- ^ — Output land 2 JL \f^k HT- Figure anode potential change produced. This is a most useful fact, for it means that we have a differential amplifier, one which responds to inputs which affect the difference of potential between the input grids, but is practically unaffected by their absolute potential. Since the small output which does appear from an in-phase signal is also in-phase, if another stage of amplification by a long- tailed pair follows, this additional stage will further discriminate against the original unwanted in-phase signal. Further, suppose an input 6Vg be applied to only one grid of a long-tailed pair. From Figure it is clear that this is the same as if we had applied 182. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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