A differential voltage amplifier which uses two NPN BJTs is shown in Figure 345.

Question

A differential voltage amplifier which uses two NPN BJTs is shown in Figure 345. Both transistors used in this amplifier are assumed to be identical and have the following parameters: beta 1 = beta 2 = 50.0 n1 = n2 = 1.0 VAF1 = VAF2 = infinity This amplifier is biased by the d.c. constant current source IEE which has an equivalent small-signal output resistance represented by rcc. as shown on the schematic. For the device parameters and component values given, calculate the value for the bias current and the minimum value for the output resistence rcc that will produce the following amplifier properties: |Adm|delta |v0/vd| = 20.0db (differential-made gain) CMRR delta |Adn/Ac| ge 80.0dB 9common-mode rejection ratio) You may assume that r not affect the differential-mode voltage gain A . Show all of your work, and explain in detail any and all assumptions you make. An NPN BJT Differential Amplifier

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