| 摘要 |
PURPOSE:To manufacture the secondary phase shift circuit of derianis type of low cost in mass-production, with the manufacturing method eplaceable the resistor and capacitor of high ablosute accuracy into those of less accuracy, by using CR product. CONSTITUTION:Among the six elements R1, R2, Ra, Rb, C1 and C2 constituting the derianis type secondary phase shift circuit, two resistors Ra and Rb determining the gain coefficient are used with higher absolute accuracy or adjusted with constant resistance ratio. To realize the values of two resistors R1, R2 and two capacitors C1 and C2 requiring higher accuracy in determining the value of center frequency and sharpness, the absolute deviation from the theoretical value of two capacitors C1 and C2 can be allowed and the relative deviation of two capacitors is within + or - 1%, and the deviation of the center frequency and sharpness with the error of the absolute deviation can be adjusted by varying the resistance value so that each CR product combinating two capacitors C1 and C2 and two resistors R1 and R2 can be theoretical value. |
