A differential amplifier with local CMFB is shown in Fig. 12.54. Use |V ov | = 0.2

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A differential amplifier with local CMFB is shown in Fig. 12.54. Use |Vov| = 0.2 V for all transistors, Vtn= ˆ’Vtp= 0.6 V, ID5= 200 µA, VAn= 10 V, |VAp| = 20 V, and γ = 0. Assume VDD= VSS= 2.5V and Vic= 0.

(a) What is the dc common-mode output voltage of this amplifier?

(b) Compute the low-frequency gains adm and acm. Compare these gains with the gains calculated in the first example in Section 12.4.1.

Figure 12.54:

VDD M4 Мз Vo2 Vo1 o 20 k2 20 k2 Vi2 M2 M1 Vi1 VBIAS M5 -Vss SS

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Analysis and Design of Analog Integrated Circuits

ISBN: 978-0470245996

5th edition

Authors: Paul R. Gray, ‎ Paul J. Hurst Stephen H. Lewis, ‎ Robert G. Meyer

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