(a) For the circuit of Problem 5.1, sketch load lines in the I c - V ce...

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(a) For the circuit of Problem 5.1, sketch load lines in the Ic- Vceplane for RL= 2 k„¦ and RL= 10 k„¦.

(b) Calculate the maximum average sinusoidal output power that can be delivered to RL (both values) before clipping occurs in (a) above. Sketch corresponding waveforms for Ic1, Vce1, and Pc1.

(c) Calculate the circuit efficiency for each value of RL in (b). (Neglect power dissipated inQ3 and R3.)

(d) Select RL for maximum efficiency in this circuit and calculate the corresponding average output power with sinusoidal signals.


Problem 5.1

A circuit as shown in Fig. 5.1 has VCC = 15V, R1 = R2 = 0, R3 = 5k„¦, RL = 2k„¦, VCE(sat) = 0.2 V, and VBE(on) = 0.7 V. All device areas are equal.

Figure 5.1

+Vc_ Q1 V; I'e RL R3 Q2 Q3 R2 R1 -Vcc

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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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