| 摘要 |
PURPOSE:To prevent variation in servo band width with a loop gain by allowing the 1st cutoff point to follow up gain variation and eliminating the need for the 2nd cutoff point. CONSTITUTION:A servo filter amplifier is so constituted that the 1st cutoff point follows up variation in gain and the 2nd cutoff point is independent of the gain variation. This circuit consists of, for example, an input terminal 1, output terminal 2, operational amplifiers 3 and 5, variable resistor 4 for varying the gain, capacitor C, and the filter composed of a capacitor C and resistances R1- R3, and R5. Then, when T1=C.(R3+A.R1) (A; DC gain) and T2=C.R3, the DC gain A and the 1st cutoff point 1/T1 vary by adjusting the variable resistor 4, but the 2nd cutoff point 1/T2 does not vary. A servo system using this circuit has no variation in servo band width. |
