Question: A feedback amplifier is shown in Fig. 8.49. Device data are as follows: Î² npn = 200, Î² pnp = 100, |V BE(on) | =

A feedback amplifier is shown in Fig. 8.49. Device data are as follows: Î²_npn= 200, Î²_pnp= 100, |V_BE(on)| = 0.7V, r_b= 0, and |V_A| = ˆž. If the dc input voltage is zero, calculate the overall gain v_o/v_i, the loop gain, and the input and output impedance at low frequencies. Compare your answers with a SPICE simulation. Also use SPICE to plot the complete large-signal transfer characteristic and find the second and third harmonic distortion in v_ofor a sinusoidal input voltage with peak-peak amplitude of 0.5 V at v_i.

+6 V 1.25 k2 Q3 10 k2 Q2 1 ko 6 k2 5 k2 -6 V -W-

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