![]() If A = 2, AdB = +6 if A = 0.5, AdB = -6 if A = 10, AdB = +20 if A = 0.1, AdB = -20 Cascade: A = A1A2, AdB = A1dB + A2dBħ More on the decibel GdB = AdB only if impedance matched If G = 2, GdB = +3 if G = 0.5, GdB = -3 if G = 10, GdB = +10 if G = 0.1, GdB = -10Ħ Definition of AdB A = vout/vin Adb = 20 log A Memorize: ![]() If x = 10y, then y = log10x y = log 10 = 1 y = log 100 = 2 y = log 1000 = 3 y = log 0.1 = -1 y = log 0.01 = -2 y = log = -3ĥ Definition of GdB G = pout/pin GdB = 10 log G Memorize: ![]() Also called the half-power frequenciesĤ Review of logarithms A logarithm is an exponent ![]() The frequency response curve of an ac amplifier A Amid 0.707 Amid f f1 10f1 0.1f2 f2 The cutoff frequencies The midband The gain is maximum in the midband. 1 MALVINO Electronic PRINCIPLES SIXTH EDITIONģ The cutoff frequencies Also called the half-power frequencies
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