| 摘要 |
<p>The present invention relates to a method of optimising cross current in class D amplifiers and simultaneously minimising the harmonic distortion. The method overcomes the problem of using the limited speed voltage comparators often used in cross current preventing circuits. The method is based on introducing of a replica amplifier with a current sensor matched to a main amplifier. The duration of the sensed cross current is compared by a current comparator with a small enough reference current. The comparator output generates a pulse with duration equal to the duration of the cross current event in the replica amplifier. The duration of that pulse is measured and used to generate dead time pulse, blanking amplifier pre-driver inputs.</p> |
