A student is performing a series of simple measurements on the circuit of Fig. P4.63 to determine mismatches in the BJT parameters. At each step the student adjusts VI so as to drive VO to 0 V and...

A student is performing a series of simple measurements on the circuit of Fig. P4.63 to determine mismatches in the BJT parameters. At each step the student adjusts VI so as to drive VO to 0 V and thus balance the circuit, and then measures VI with the voltmeter. The component values are VCC 5 2VEE 5 6 V and RC1 5 RC2 5 10 kV. (a) With RB1 5 RB2 5 0 the student fi rst adjusts VI to balance the circuit, and then adjusts IEE to place the collector voltages exactly at 1.0 V. If it is found that VI 5 22.5 mV, what is the saturation current ratio Is1yIs2? (b) With RB1 5 0 and RB2 5 1.0 kV the student fi nds that balancing now requires VI 5 24.5 mV. What are IB2 and F2? (c) With RB1 5 1.0 kV and RB2 5 0 the student fi nds that balancing now requires VI 5 0 V. What are IB1 and F1? (d) Predict VI with RB1 5 RB2 5 1.0 kV. (e) What is the input offset voltage VOS, the input bias current IB, and the input offset current IOS?