| 摘要 |
A semiconductor laser drive circuit of the present invention reduces the number of wires, solves the out-of-timing problem of pulses due to differences in wire length, and emit short light pulses at a high transfer rate. A common emitter circuit ( 18 ) converts a voltage signal (J 1 ) input at an input port ( 18 a) into a current signal and, when reading information, adds the current signal to a signal output from a high-frequency oscillator circuit ( 20 ). High frequency components of the current signal converted from the voltage signal (J 1 ) within a bandwidth of a transistor (Q 6 ) are boosted. Degradation of the output signal of the high-frequency oscillator circuit ( 20 ) is kept at a minimum by a common base circuit including the transistor (Q 6 ). A current switch circuit ( 16 ) cuts off or lets through the output current of a current mirror circuit ( 12 ). |
