北京张林问:在电子电路,特别是在高频电路中,常常会碰到所谓“优值”。什么是优值?,它对电路有什么影响? 答:优值是品质因素Q的简称,它是器件的电抗值X_L或X_C与等效串联电阻r之比值。即:Q=ωL/r或Q=l/(ωcr)。X越大,r越小,则Q越高;反之越低。常用谐振器的优值量级见表1。 Beijing Zhang Lin asked: In electronic circuits, especially in high-frequency circuits, often encounter the so-called “gifted value.” What is the value ?, What is the effect on the circuit? A: The merit is the abbreviation of the quality factor Q. It is the ratio of the device reactance X_L or X_C to the equivalent series resistance r. That is: Q = ωL / r or Q = l / (ωcr). The larger the X, the smaller r, the higher the Q; the lower the contrary. The magnitude of the commonly used resonator see Table 1.