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Chapter 10 Analog Integrated Circuits The 741 OP-AMP Introduction.

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Presentation on theme: "Chapter 10 Analog Integrated Circuits The 741 OP-AMP Introduction."— Presentation transcript:

1 Chapter 10 Analog Integrated Circuits The 741 OP-AMP Introduction

2 Fig The 741 op-amp circuit. Q 11, Q 12, and R 5 generate a reference bias current, I REF, Q 10, Q 9, and Q 8 bias the input stage, which is composed of Q 1 to Q 7. The second gain stage is composed f Q 16 and Q 17 with Q 13 acting as active load. The class AB output stage is formed by Q 14 and Q 20 with biasing devices Q 18 and Q 19 and an input buffer Q 23. Transistors Q 15, Q 21, Q 24, and Q 22 serve to protect the amplifier against output short circuit and are normally off.

3 Bias Circuit Short-Circuit Protection

4 Input Stage The Second Stage The Output Stage Device Parameters

5 Fig The dc analysis of the 741 input stage. The DC Analysis of the 741

6 Fig The dc analysis of the 741 input stage, continued

7 Fig Small-signal analysis of the 741 input stage Small-Signal Analysis of the 741 Input Stage

8 Fig The load circuit of the input stage fed by the two complementary current signals generated by Q 1 through Q 4 in Fig The order of the analysis steps is indicated by the circled numbers.


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