1. Using DC analysis, and assuming that the transistors (QREF and Q) are in the active...

 

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1. Using DC analysis, and assuming that the transistors (QREF and Q₁) are in the active mode, determine the value of RREF required for generating a copy current of 0.755 mA. Take the value of Vcc to be 8 V, and the value of VBE in the active mode to be equal to 0.7V. QREF RREF www Vin Vcc Vout Figure 3 Single-stage amplifier biased by a simple current mirror device 2. The circuit shown in Figure 3, is a common-emitter amplifier with a load consisting of an NPN current mirror. Assuming now that Early Effect voltage is finite (i.e. VA ∞), derive a symbolic expression for the small-signal voltage gain of the circuit. 1. Using DC analysis, and assuming that the transistors (QREF and Q₁) are in the active mode, determine the value of RREF required for generating a copy current of 0.755 mA. Take the value of Vcc to be 8 V, and the value of VBE in the active mode to be equal to 0.7V. QREF RREF www Vin Vcc Vout Figure 3 Single-stage amplifier biased by a simple current mirror device 2. The circuit shown in Figure 3, is a common-emitter amplifier with a load consisting of an NPN current mirror. Assuming now that Early Effect voltage is finite (i.e. VA ∞), derive a symbolic expression for the small-signal voltage gain of the circuit.