| 摘要 |
Provided are a drive circuit and a customer-side device capable of suppressing the temperature dependency of a light signal in a transmission circuit to achieve satisfactory communication. The drive circuit is provided with a bias current supply circuit whereby a bias current is supplied to a light-emitting element for transmitting a light signal, and a modulation current supply circuit whereby a modulation current with an intensity corresponding to the logical value of the data to be transmitted is supplied to the light-emitting element. The drive circuit has: a first path wherein the bias current flows; a second path containing a path for supplying the modulation current from the modulation current supply circuit to the light-emitting element so that when the bias current flows, the current flows from the bias current supply circuit through the modulation current supply circuit and back to the bias current supply circuit without passing through the light-emitting element; and a third path which merges with the second path in the modulation current supply circuit and is provided with an adjustment resistor upstream of the merge so that when the bias current flows, the current flows between the bias current supply circuit and the third path through the adjustment resistor. |
