Question 4Figure Q4a shows a basic current mirror structure (in its'sink' form) which is designed to provide the current Ir atits output Io by operating transistors Ti and T2 identically :VDDIRIRT3T1T2T1T2OVOVFigure Q4a : Current MirrorFigure Q4b : Widlaw Mirrora)Show that the current relationship of the circuit in figure Q4a is( where Ic = BIb for both transistors and T1 and T2 are matched) :IR2=|1+If the two transistors in figure Q4a are not matched in terms ofb)their Vbe's compensation can be provided by placing a resistor 'R'in one of the emitter legs of the transistors.Assuming Vbez > Vbel by 0.05V and Ir = Io = 10mA sketch anappropriate structure and value for R.c)Describe how the 'offset' compensation referred to in Q4boccurs in practice for a 741 op-amp ?d)Sketch the 'Source' form of figure Q4ae)Figure Q4b shows the buffered Widlar mirror. Brieflydescribe how the addition of transistor T3 improves operation.

IR =IC1+2IB IB1=IB2=IBIC2 = IoIB2=Ioβ IC1 = βIB1 = βIoβ=Io

Figure Q4a shows a basic current mirror structure (in its 'sink' form) which is designed to provide the current Ir at its output Io by operating transistors T1 and T2 identically : Question 4 VDD IR T3 TI T2 TI T2 OV OV Figure Q4a : Current Mirror Figure Q4b : Widlaw Mirror Show that the current relationship of the circuit in figure Q4a is ( where Ic = BIb for both transistors and T1 and T2 are matched) : IR 1+ b) If the two transistors in figure Q4a are not matched in terms of their Vbe's compensation can be provided by placing a resistor 'R' in one of the emitter legs of the transistors. Assuming Vbez > Vbel by 0.05V and IR = Io = 10mA sketch an appropriate structure and value for R. c) Describe how the 'offset' compensation referred to in Q4b occurs in practice for a 741 op-amp ? (p Sketch the 'Source' form of figure Q4a e) Figure Q4b shows the buffered Widlar mirror. Briefly describe how the addition of transistor T3 improves operation.

Figure Q4a shows a basic current mirror structure (in its 'sink' form) which is designed to provide the current Ir at its output Io by operating transistors T1 and T2 identically : Question 4 VDD IR T3 TI T2 TI T2 OV OV Figure Q4a : Current Mirror Figure Q4b : Widlaw Mirror Show that the current relationship of the circuit in figure Q4a is ( where Ic = BIb for both transistors and T1 and T2 are matched) : IR 1+ b) If the two transistors in figure Q4a are not matched in terms of their Vbe's compensation can be provided by placing a resistor 'R' in one of the emitter legs of the transistors. Assuming Vbez > Vbel by 0.05V and IR = Io = 10mA sketch an appropriate structure and value for R. c) Describe how the 'offset' compensation referred to in Q4b occurs in practice for a 741 op-amp ? (p Sketch the 'Source' form of figure Q4a e) Figure Q4b shows the buffered Widlar mirror. Briefly describe how the addition of transistor T3 improves operation.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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