| 摘要 |
PURPOSE:To omit a highly accurate comparator and to shorten an integrating time, by integrating a weight signal and a reference signal until an analog weight signal reaches a zero crossing point at a specified inclination, then performing high speed integration and reverse integration for a specified time at an inclination of a specified multiplication, and operating the result. CONSTITUTION:A weight signal Vx is integrated for a period T1 through a switch SW0 and an integrating circuit A (a switch SW1 is OFF). An output (e) with a reference voltage Vc as a zero level is obtained. A control circuit 3 sets the switch SW0 to the side (b) and turns ON a switch SW2 (SW1 is OFF), and a reference voltage Va is integrated for a period T2. When the voltage (e) crosses a zero level, the output of a comparator 2 is inverted. Then the control circuit 3 turns ON the switch SW1. The time constant of the integrating circuit A is made to be 1/10, and the reference voltage Va is integrated for a period T3. Then the circuit 3 turns OFF the switch SW2 and turns ON the SW3, and the integration is performed. The output (e) is processed in a counting and operating circuit 5, and the weight is obtained. |
