| 摘要 |
<p>PURPOSE:To avoid the effect of a pulse drive circuit onto a high sensitive sensor circuit by driving alternately an object element and a dummy element so as to make the load current in the entire pulse drive circuit constant. CONSTITUTION:A drive circuit has a driver A12 driving a load and a driver B12 driving a slave load through which no current flows when a master load has a current flow. The driver B12 drives a load flowing the same current as that of the master load, e.g., a resistor 11. The sum between a current i1 flowing to the master load and a current i2 flowing to the slave load, i1+i2 is a completely constant current when i2=i1, but in general there is an error nearly 10%. The error is 1/10 in comparison with the ripple due to the master load current, which offers a remarkable improvement.</p> |
