Variable Delay Line
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-16
A rectangular slab of semiconductor material 1 in a magnetic field (Fig. 1) exhibits two phenomena when a current passes through the long dimension. Without a magnetic field, the current runs in the long direction and the dashed equipotential lines run perpendicular to the long direction. In the presence of a magnetic field, which is perpendicular to the surface, the solid equipotential lines are tilted at an angle P (Hall angle). Under these conditions, a voltage (Hall) appears between probes 4, 5. Simultaneously, an increase in resistance can be measured between probes 2, 3, the magnetoresistance effect. It is this latter effect which can be exploited to form a variable delay line.