| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiplication circuit capable of performing simple and high-speed multiplication without requiring digital processing or logarithmic processing. SOLUTION: In the multiplication circuit, a first constant current supply 21 charges a first capacitor c1 with a first constant current i1. A comparator cp1 compares a voltage Vc1 across the first capacitor c1 with a first constant voltage V1. A second constant current supply 31 supplies a second constant current i2 of the dimension matching a second voltage V2 to charge a second capacitor c2. A control circuit 5 controls a first charging switch Q10 and a second charging switch Q22 to finish charging to the first capacitor c1 and the second capacitor c2 when the voltage Vc1 across the first capacitor c1 becomes greater than the first voltage V1 after starting charging to the first capacitor c1 and charging to the second capacitor c2 at the same time. A result holding circuit 6 outputs a voltage Vc2 across the second capacitor c2 at the end of charging to the first capacitor c1 and the second capacitor c2 as a multiplication value found by multiplying the first voltage V1 and the second voltage V2 mutually. COPYRIGHT: (C)2010,JPO&INPIT |
