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四、回压差和灵敏度(一)回压差和回压比对反馈放大器的分析,常常采用回压比T和回压差F.如图25(a)所示,在晶体管的输入端剖开,一面加电压源U_3,另一面连接终端电阻,摹仿晶体管的输入电阻R_i,其上量得电压U_4,就是回来的电压.这样两个电压之比的负值U_4/U_3称为回压比,负号表示U_4与U_3有相移180°.如果加上的电源为单位电压,U_3=1,那末回压比写成:
Back pressure differential and sensitivity (A) Back pressure and back pressure ratio Feedback amplifier analysis, often using the back pressure ratio T and back pressure difference F. As shown in Figure 25 (a), the input of the transistor profile Open, the voltage source U_3 side, the other end connected to the terminal resistance, the analog transistor input resistor R_i, the amount of voltage U_4, is the voltage back.Thereupon, the negative value of the ratio of the two voltage U_4 / U_3 called back pressure ratio , The negative sign indicates that U_4 and U_3 have a phase shift of 180. If the power supply is added to the unit voltage and U_3 = 1, then the back pressure ratio is written as: