| 摘要 |
PURPOSE:To make it possible to set a coefficient easily by providing an input circuit which can be held at a bias level when an input signal is below the bias level and obtain a signal proportional to the part when above the bias level. CONSTITUTION:Operational amplifier 6 and diode 7 constitute the ideal diode circuit, and this and variable resistor 8 constitute input circuit 9. Input signal Vi-1 supplied between input terminal 1i-1 and common input terminal 1c is inputted to circuit 9, whose output V'i-1 is divided 8, and the signal is given coefficient Ki-1 and then inputted to arithmetic circuit 2, but since its bias component is removed by bias power supply 5 at this time, the signal inputted to circut 2 is Ki-1 (V'i-1-1). As for input characteristics (a) of the ideal diode circuit, signal V'i-1 is held at thr bias level when signal V'i-1 is below bias level (DClV) and becomes a signal proportional to the part above the bias level of Vi-1 when it is above the bias level. |
