| 摘要 |
A first peaking current generating section 1 generates a first peaking current P 1 in synchronism with the transitions of a digital signal S, being positive at the rising edge and negative at the falling edge. A second peaking current generating section 3 generates a second peaking current P 2 in synchronism with the transitions of the digital signal S, being negative at the rising edge and positive at the falling edge. A first light emitting element driving section 2 produces a first driving current D1 obtained by combining together a signal amplitude current according to the amplitude of the digital signal S and a first peaking current P 1. A second light emitting element driving section 4 produces a second driving current D 2 obtained by combining together the signal amplitude current according to the amplitude of the digital signal S and a second peaking current P 2. Then, the first and second light emitting element driving sections 2 and 4 drive the light emitting element 5 by using a driving current D 3 obtained by subtracting the first driving current D 1 from the second driving current D 2.
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