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Transcript
Physics 536 - Assignment #7 1. Consider the current mirror circuit shown below: VCC Ic R1 Q2 Q1 R2 R3 VEE Determine appropriate values for R1 , R2 and R3 that will produce Vb = −5 V and give Ic = 10 mA when VCC = +10 V and VEE = −10 V. A reasonable choice for the current that will flow through Q1 is 1 mA. Assume that Vbe = 0.7 V. 2. Suppose the current mirror described in question 1 was used as a current source in the differential pair amplifier shown below: VCC R6 Vout Vin Q2 Q2 R4 R5 R1 Ic = 10 mA Q2 Q1 R2 R3 VEE Suppose the component values were R4 = R5 = 50 Ω and R6 = 500 Ω and that the capacitor is large enough that it does not change the shape of the output waveform. (a) Show that the small signal gain of this circuit is G = +5. (b) What is the output impedance of this circuit? (c) If the circuit were connected to a resistive load, RL = 5 kΩ, what would be the amplitude of the voltage, vL , measured across the load, in terms of vin ? 3. Suppose the output of the previous circuit was connected to an emittor follower using a transistor with β = 100 as shown below, in which R7 = 100 kΩ and R8 = 1 kΩ. The purpose of R7 is to keep the base of Q3 at a well defined DC voltage. VCC R6 Q3 Vin Vout Q2 Q2 R4 R7 R5 R8 R1 Ic = 10 mA Q2 Q1 R3 R2 VEE (a) What is the output impedance of this amplifier circuit? (b) If a resistive load of RL = 500 Ω, what would be the amplitude of the voltage, vL , measured across the load?
