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四、固定式偏置电路分析方法和思路培养 1.典型固定式偏置电路分析方法如图11所示是固定式偏置电路。电路中的VT1是NPN型三极管,电路采用正极性电源+V供电,R1是VT1管的固定式偏置电阻。基极偏置电阻的判断方法是:偏置电阻在基极回路中,且回路有直流电源。电阻R1在直流电压+V回路中,而且回路中有直流工作电压+V,R1能够为VT1管提供基极电流,所以R1是基极偏置电阻。进一步确认R1是基极偏电阻的方法是:分析基极电流回路,直流工作电压+V→R1→VT1基极→VT1发射极→通过地线回到直流工作电压+V的负极(图中未画出)。了解电路分析的细节可以深化电路工作原理的理解,对这一电路的分析细节说明下列几点: (1)在直流工作电压+V和电阻R1的阻值大小确定后,流入三极管的基极电流就固定,所以R1称为固定式偏置电阻。 (2)无论是采用正极性直流电源还是
Fourth, the fixed bias circuit analysis methods and ideas training 1. Typical fixed bias circuit analysis method shown in Figure 11 is a fixed bias circuit. VT1 in the circuit is NPN type transistor, the circuit adopts the positive polarity power supply + V to supply power, R1 is the fixed bias resistor of VT1 tube. The base bias resistor to determine the method is: bias resistor in the base loop, and the loop DC power supply. Resistor R1 in the DC voltage + V loop, and the circuit has a DC operating voltage + V, R1 VT1 tube can provide base current, so R1 is the base bias resistor. To further confirm that R1 is the base bias resistance method is: Analysis of the base current loop, DC operating voltage + V → R1 → VT1 base → VT1 emitter → back to the negative DC operating voltage + V through the ground (not shown Draw). Understand the details of circuit analysis can deepen the understanding of the working principle of the circuit, analysis of the details of this circuit shows the following points: (1) in the DC voltage + V and the resistance of the resistance R1 size is determined, the base current into the transistor It is fixed, so R1 is called a fixed bias resistor. (2) Whether using a positive DC power supply or not