| 摘要 |
A driver circuit that prevents amplitude reduction at a high temperature comprises a differential pre-buffer circuit 22 for performing signal clamping by diodes 16 and 17 each having a nonlinear voltage-current characteristic with respect to an input signal and a differential output circuit 23 for amplifying output signals of the differential pre-buffer circuit 22, for output. The driver circuit further includes a temperature characteristic compensation circuit 44 for controlling direct currents to be passed through the diodes 16 and 17 based on a current to be passed through a diode 43 having a voltage-current characteristic with the same temperature coefficient as those of the diodes 16 and 17. A current related to constant currents I1 and I2 is supplied from the temperature characteristic compensation circuit 44 as a current that cancels the temperature characteristic of a fall in forward voltages of the diodes 16 and 17.
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