A BiCMOS Class AB output stage is shown in Fig. 5.43. Device parameters are β F (npn)
Question:
(a) Calculate bias currents in all devices for Vo = 0.
(b) Calculate the positive and negative limits of Vo for RL = 200 Ω. Thus calculate the maximum average power that can be delivered to RL before clipping occurs.
(c) Use SPICE to check (a) and also to plot the complete dc transfer characteristic of the circuit from Vi to Vo. Also plot the waveforms of Ic1, Ic2, and Id2 for a sinusoidal output voltage at Vo of 2 V and then 4 V zero-to-peak. In the simulation, assume bipolar parameters as in Fig. 2.32 and MOS parameters as in Table 2.3 (apart from the values of βF and μpCox given above).
Figure 5.43:
Fig. 2.32:
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Related Book For
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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