The circuit in the figure to the right is a current mirror. The supply voltages are ±6 V. The two transistors are equivalent and have VBE = 0.7 V, VCE,sat = 0.3 V, VA = 80 V, and β = 200. The reference resistor is RREF = 11 kΩ. Calculate the collector current of transistor Q1, IC,Q1.
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The circuit in the figure to the right is a current mirror. The supply voltages are ±6 V. The two transistors are equivalent and have VBE = 0.7 V, VCE,sat = 0.3 V, VA = 80 V, and β = 200. The reference resistor is RREF = 11 kΩ. Calculate the collector current of transistor Q1, IC,Q1.
![The figure below shows a circuit that consists of two BJTs. Both transistors Q1 and Q2 are constructed with similar geometry and design parameters. The supply voltage, Vcc = 7 V, and the value of the resistor, R, is 6.3 kohm. Assume all the transistors are biased in the active region with similar current gain, B = 100, and base-emitter voltage, VBE = 0.7 V. (a) State the type of the circuit shown above. [3 marks] (b) State one disadvantage of using BJT compared to MOSFET in this application. [3 marks] (c) Determine the collector current of transistor Q2. [5 marks] (d) Determine the collector current of transistor Q1. [4 marks] (e) Explain the cause of the mismatch between the input reference current, IR, and the output current, IC1. [5 marks] (f) Suggest a circuit topology that reduces the mismatch between the input reference current and the output current. Sketch and label the suggested circuit. Use only BJTs in your proposed circuit. [5 marks]](https://www.doubtrix.com/js/ckeditor/filemanager/connectors/php/editor/1695265632-Q288.png)