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Step of 7 9.050P Refer Figure P8.57 in the textbook Draw the modified differential amplifier - 2(r, + 2 2(r, R, R, 2 Figure Step Write the expression for base current Write the expression for input resistance, R = Step Apply voltage law to left side loop in Figure 1. 2 2 0 Vsig Thus, the gain for left side circuit Vid Step The differential output voltage is, = Thus, the gain for right side circuit Vid Calculate the expression for overall differential voltage gain = aRc Thus, the overall differential voltage gain, G, is Step Calculate the expression for overall differential voltage gain when - Substitute for Thus, the expression for overall differential voltage gain when is Step Calculate the expression for overall differential voltage gain in terms of aRc Substitute for a B+1 B B+1 BRC Consider the expression for overall differential voltage gain when doubled BRC = Step Calculate the ratio of two gain expressions BRC 201 202 Calculate the percentage increase in G. when is doubled 100 =0.5% Thus, the factor of G. is increased by 0.5%