DIFFERENTIAL DRIVER CIRCUIT

摘要

In this current mode differential driver circuit, replica transistors (M5 to M8) having high on-resistance values with respect to output switch transistors (M1 to M4) that configure driver main units (11 and 12) are connected in parallel so that, by causing low current to flow at the replica transistors (M5 to M8) to replica termination transistors (R9 and R10) which have resistance values which are larger than the actual termination resistors, virtual potentials of the plus side and the minus side are acquired at replica circuits (13 and 14) so as to feed-back the virtual potentials to current source transistors (M9 and M10). As a result, variation in resistors and variation in transistors are compensated for in order to achieve a differential driver circuit which performs well for long-distance transmission at a low power supply voltage.