| 摘要 |
PURPOSE:To prevent the generation of a differentiation signal and to perform high-precision multiplying operation by adding switching elements which ground an output side speedily when switching elements turn off. CONSTITUTION:A time-division multiplying circuit is provided with a pulse-width modulating circuit 1, amplifying circuits 2 and 3, an LPF5, and a switching circuit 4, and switching elements AS3 and AS4 are added for switching elements AS1 and AS2 of the switching element 4. Those elements AS3 and AS4 ground the output side speedily when the elements AS1 and AS2 turn off by outputs + or -EY of amplifying circuits 2 and 3. Then, the stray capacitance elements C10 and C20 of the elements AS1 and AS2 are discharged instantaneously to eliminate a differentiation signal appearing at the input side of the LPF5, realizing the high-precision multiplying operation. |
