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The shown circuit is called the cascode configuration, where two transistors are cascaded. The parameters for each transistor in the figure are β1 = 80, β2 = 50 and VBE(on) = 0.7 V. a) Assume both transistors are active, calculate all the currents in the circuit. b) Verify that the assumption in part (a) is correct c) Calculate the ratio Ix/IB1 d) Express Ix/IB1 in in terms of β1 and β2.

The shown circuit is called the cascode configuration, where two transistors are cascaded. The parameters for each transistor in the figure are β1 = 80, β2 = 50 and VBE(on) = 0.7 V. a) Assume both transistors are active, calculate all the currents in the circuit. b) Verify that the assumption in part (a) is correct c) Calculate the ratio Ix/IB1 d) Express Ix/IB1 in in terms of β1 and β2.

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The shown circuit is called the cascode configuration, where two transistors are cascaded. The parameters for each transistor in the figure are β1 = 80, β2 = 50 and VBE(on) = 0.7 V. a) Assume both transistors are active, calculate all the currents in the circuit. b) Verify that the assumption in part (a) is correct c) Calculate the ratio Ix/IB1 d) Express Ix/IB1 in in terms of β1 and β2.

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Hand Calculation The shown circuit is called the cascode configuration, where two transistors are cascaded. The parameters for each transistor in the figure are B1 = 80, B2 = 50 and VBE(on) = 0.7 V. a) Assume both transistors are active, calculate all the currents in the circuit. b) Verify that the assumption in part (a) is correct c) Calculate the ratio Ix/IB1 d) Express Ix/IB1 in in terms of B1 and B2. Simulation Draw the circuit on LTSpice and create: a model for Q1 with IS = 1x10-15 A, and BF = 80 a model for Q2 with IS=1x10-15 A, and BF = 50 a) Verify the current values in part (a) in the hand calculations b) From the simulation results calculate Ix/IB1 and verify part (c) in the hand calculations c) Try different values for B1 and B2 and verify the expression obtained in part (d) in the hand calculations Notes: Homework submission is through the Moodle platform Submit a single compressed file containing a folder for each question containing : The hand calculations Screenshots showing the circuit and the simulation results for parts (a) (b) and (c) The schematic file (.asc) The netlist file (.net)
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