| 摘要 |
PURPOSE:To use a circuit as an oscillator or a band pass filter, by trimming the value of a feedback resistance. CONSTITUTION:An adding circuit consisting of an operational amplifier A1 and the first integrating circuit consisting of an operational amplifier A2 are connected between input and output terminals, and the second integrating circuit consisting of an operational amplifier A3, a feedback resistance R6, and a capacitor C2 is connected to the feedback loop from the output to the input. A transfer function T(s) of this circuit is expressed by equation. Since this equation is a secondary band pass function type, the output V2 has a band pass filter characteristic. In case that this circuit is operated as an oscillator, input and output V0 and V2 are connected and the resistance R6 is trimmed to make 0<R6<=R1.R5/R2 true. |
