An amplifier stage is shown in Fig. 7.41 where bias current I B is adjusted so that
Question:
(a) Calculate the low-frequency, small-signal trans-resistance Ï o/ii and use the zero-value time-constant method to estimate the 3-dB frequency. Data: npn: β = 100, fT = 500 MHz at IC = 1 mA, Cμ0 = 0.7 pF, Cje = 3 pF (at the bias point), Ccs0 = 2 pF, rb = 0, and VA = 120 V. Assume n = 0.5 and Ï0 = 0.55 V for all junctions. pnp: β = 50, fT = 4 MHz at IC = 0.5 mA, Cμ0 = 1.0 pF, Cje = 3 pF (at the bias point), Cbs0 = 2 pF, rb = 0, and |VA| = 50 V. Assume n = 0.5 and Ï0 = 0.55 V for all junctions.
(b) Repeat (a) if a 20-pF capacitor is connected from collector to base of Q1.
Fig. 7.41:
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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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