By B. W. Allen (auth.)
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22 23 2. 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 .
Note that as the frequency has risen to a point where voltage gain approaches unity (100 MHz), the phase angle is approaching 90°. 15 . 16. 16 Simplified equivalent circuit Rin2 = RS3 //RS4 //hie2 Note that Rin2 does not equal R p ! hfe, is divided into two paths, one through Ru, the other through Xc c in series with Rin2. The ratio of the two currents is determined by the relationship between the impedance ofeach'leg' . 17. 17 Current dividing network 41 2. Cascaded Amplifiers In the amplifier under consideration, ZI = RLI and Z2 = XCc + hie2.
2314n Note: Remember that the effective resistance of several resistors in parallel is always less than the lowest resistor value. e. , 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.