By B. W. Allen (auth.)
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Extra resources for Analogue Electronics for Higher Studies
Calculate: (a) the gain ofthe amplifier. (b) the stage gain with an identical stage added. e. in high band, the reactance of the input capacitance of the next stage , Cs, begins to fall. ib to affect the performance of the circuit. Any reduction in the current in R p will reduce the voltage developed across it, thereby reducing stage gain. 13 . 14. 14 Simplifiedequivalent circuit 35 2. Cascaded Amplifiers Deriving the expression for high band gain (AH) V2 AH = V1 V1 = ib hie1 V2 = - hIe ib Zp AH = -hIe ib Zp ib hie1 ibs cancel out so ...
584 dB Note: To convert a numeric voltage ratio into the logarithmic form use A v (dB) = 20 log 10 A v and to convert a logarithmic voltage ratio into numeric form use A v = 10 ( Av (dB») 20 Each amplifier is described as a ' stage' of amplification and variou s circuit arrangements are available for performing inter-stage coupling. c. ) conditions Transformer, direct coupling and resistance-capacitance circuits are the most popular methods, each having advantages and disadvantages compared with the others .
Later in this chapter it will be shown that the 'roll-off' rate at each end of the amplifier 's response is 20 dB per decade (in the linear sections). Analysis of the circuit at frequencies in each of the three bands will now take place in order to develop expressions for amplifier gain. The first frequency to be selected will be in mid band so that the effects of Cc and C s will have negligible effect upon the analysis . 1 Analysis at 1 kHz (Typical mid band frequency) The reactance of the coupling capacitor at I kHz will be very low in comparison with other circuit resistances.