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8775Discrete Differential Amplifier (Open loop Impedance and gain) [Analog Electronics::Analog Circuit Design], Saturday, June 25th - 6:12 PM
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http://www.dutchforce.com/~eforum/index.php?showtopic=44021&view=getlastpostI want to calculate the open loop output impedance and open loop differential gain of a discrete differential amplifier (Figure attached)<br><br>Here is the approach. <br><br><b>INPUT STAGE: Q111 and Q112</b><br><br>Av1 = Rtot/2re, where Rtot is the total resistance of R117 and the input resistance of Q78 which is Rin. <br>So the gain Av = Rtot/500 ohms. <br><br>If hFE for Q78 is 250,<br>Rin = hFE*(R115+re) = (oteggis)Sat, 25 Jun 2016 18:12:40 +0200http://creativecommons.org/licenses/by-nd/2.5/