1. Figure 7.27 A simple but inefficient approach for differential to single-ended conversion.
sedr42021_0727.jpg

2. Circuit for a basic MOSFET constant-current source.
sedr42021_0604.jpg

3. Basic MOSFET Current Mirror.
sedr42021_0605.jpg

4. Figure 7.28 The active-loaded MOS differential pair.
sedr42021_0728a.jpg

5. Figure 7.28 The circuit at equilibrium assuming perfect matching.
sedr42021_0728a.jpg

6. Assignment # 2
Problems 7.11, 7.14, 7.16, 7.20, 7.21, 7.22, 7.23, 7.31, 7.33, 7.34, 7.36, 7.37, 7.38 Due date: 30th March 2012

7. Figure The circuit with a differential input signal applied, neglecting the ro of all transistors.
sedr42021_0728a.jpg

8. Figure Determining the short-circuit transconductance Gm =io/vid of the active-loaded MOS differential pair.
sedr42021_0729a.jpg

9. Figure 7. 30 Circuit for determining Ro
Figure Circuit for determining Ro. The circled numbers indicate the order of the analysis steps.
sedr42021_0730.jpg

10. Figure Analysis of the active-loaded MOS differential amplifier to determine its common-mode gain.
sedr42021_0731a.jpg

11. Figure (a) Common-source amplifier with a resistance RS in the source lead. (b) Small-signal equivalent circuit with ro neglected.
sedr42021_0444a.jpg

12. Common Mode Gain (Acm)
vicm vo
vgs3 =-vsg4

13. Common Mode Gain (Acm) & CMRR
vicm vo
vgs3 =-vsg4

14. Common Mode Gain (Acm) & CMRR

15. Exercise 7.12

16. The basic BJT current mirror.
sedr42021_0608.jpg

17. A simple BJT current source.
sedr42021_0610.jpg

18. Figure 7.32 Active-loaded bipolar differential pair.
sedr42021_0732a.jpg

19. Figure 7.32 Small-signal equivalent circuit for determining the transconductance Gm=; io/vid.
sedr42021_0732a.jpg

20. Differential Gain Ad
vid/2
-vid/2 vo

21. Differential Gain Ad

22. Figure 7.32 Equivalent circuit for determining the output resistance Ro =vx/ix.
sedr42021_0732a.jpg

23. Figure Analysis of the bipolar active-loaded differential amplifier to determine the common-mode gain.
sedr42021_0733.jpg

24. Figure Analysis of the bipolar active-loaded differential amplifier to determine the common-mode gain.
sedr42021_0733.jpg

25. Common Mode Gain
vicm
vbe3 = -vbe3 vo i1 i2

26. Common Mode Gain

27. Common Mode Gain

28. Common Mode Gain

29. Common Mode Rejection Ratio (CMRR)