7.22 Sketch the i C−vCE characteristics of an npn transistor having β = 100 and VA = 100 V. Sketch characteristic curves for i B = 20 μA, 50 μA, 80 μA, and 100 μA. For the purpose of this sketch, assume that iC = β iB at vCE = 0. Also, sketch the load line obtained for V CC = 10 V and RC = 1 k. If the dc bias current into the base is 50 μA, write the equation for the corresponding iC−vCE curve. Also, write the equation for the load line, and solve the two equations to obtain VCE and IC. If the input signal causes a sinusoidal signal of 30-μA peak amplitude to be superimposed on IB, find the corresponding signal components of iC and vCE.