A section of a differential amplifier stage which uses NPN BJTs is shown in Figu

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A section of a differential amplifier stage which uses NPN BJTs is shown in Figure 334. Both sides of this stage are evenly matched so that there are no d.c. offset effects. As was discussed in class, the equal-valued emitter resistors (RE1 and RE2) can be used to decrease the effective transconductance g meff and to increase the differential input impedance Z ind. For this configuration, calculate values for the transistor current agin pr, the emitter bias current beta F and the emitter resistors IEE, and RE2 to realize the following amplifier properties: To save you some time, you may find the following equations useful: You may assume that both transistor emission coefficients are unity and that the thermal voltage is 26mV. Differential BJT Amplifier Section With Emitter Resistors

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