Analogue Electronics for Higher Studies by B. W. Allen (auth.)

By B. W. Allen (auth.)

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This effect is the same as that experienced by an R-C coupled amplifier at high frequencies and will be dealt with under that heading. c. signals may be amplified. g. light, temperature, humidity, water quality, etc. c. 5 Directly-coupled amplifier response Note: These signals could not be amplified by a transformer-coupled or an R-C coupled amplifier because the d,c. content ofthe signal would be blocked by the coupling components. The excellent low frequency response of directly-coupled amplifiers leads to their extensive use in high quality audio amplifiers.

Bode plots use logarithmic values for both gain and frequency . As has been explained earlier in this chapter, gains expressed in dB are simply added in order to obtain the overall gain of several cascaded stages . This is also true of Bode plots, which may be added together linearly in order to produce the response for a multi-stage amplifier. 2. 18. lowband o -3 Gain (dB) midband high band Gain --:-:---:-: _, -:-: J-:-: __-:-: __-:-: __-:-: __-:-: __-:-:__-:-: __-:-: __-:-: J-:-: I I ! 18 Bode plot for wide band amplifier Note that f 1 and f2 occur when the phase angle (relative to AM) leading for f ll lagging for f2.

Cascaded Amplifiers 43 At 100 Hz As the frequency is ] 0 times smaller, the 'j' quantity is ] 0 times larger, and... 2 L = 100 L. 75 dB AtlOHz Similarly, A _ 100 L. 6 Prediction of the lower 3 dB frequency (f1) f] is the frequency in low band at which the gain of the amplifier is 3dB . band re fierence gam . (or AM down on mid -fi)' so, AL(f1) AM AM = -¥2 = 1 [ 1 + j W1 C c (RU + Rin2 )] {2=1+. 1 J W1 C C (Ru + Rin2 ) {2=1-j 1 W1 C C (Ru + Rin2) But, for the magnitude of] - jx to equal E, x must equal].

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