Abstract: A high-speed high-current laser driver integrated circuit is invented. The laser driver includes an input stage circuit, a pre-drive circuit, a negative capacitance circuit, three parallel-connected output stages, and an active reverse termination circuit. A pair of voltage signals VIP, VIN are applied to the input stage circuit which amplifies these input signals to a pair of output voltage signals V1IP, V1IN. Then the voltage signals V1IP, V1IN are amplified by the pre-drive circuit to a pair of voltage signals V+, V? to the output stage circuit, and finally, a pair of modulated current signals IOP, ION are generated by the output stage circuit. The present invention does not use terminal resistance in the output stage circuit, so the power consumption of the circuit is much lower than that of the traditional circuit.

Abstract: A laser driver with high-speed and high-current and current modulating method thereof is invented. The laser driver includes a first driving unit and a second driving unit, each driving unit including a pre-drive amplifier circuit and a main drive amplifier circuit. The pre-drive amplifier circuit includes a first differential transistor pair circuit, a differential voltage conversion circuit, a DC common mode level reduction circuit and a first cascode current mirror circuit. The main drive amplifier circuit includes a second differential transistor pair circuit, a bandwidth boost circuit, a matching circuit and a second cascode current mirror circuit. The present invention avoids the enhancement of chip area caused by the use of passive inductors peaking mode to enhance bandwidth, and reduces the cost of chip, design complexity and circuit power consumption.

Abstract: A high-speed high-current laser driver integrated circuit is invented. The laser driver includes an input stage circuit, a pre-drive circuit, a negative capacitance circuit, three parallel-connected output stages, and an active reverse termination circuit. A pair of voltage signals VIP, VIN are applied to the input stage circuit which amplifies these input signals to a pair of output voltage signals VIIP, VIIN. Then the voltage signals VIIP, VIIN are amplified by the pre-drive circuit to a pair of voltage signals V+, V? to the output stage circuit, and finally, a pair of modulated current signals IOP, ION are generated by the output stage circuit. The present invention does not use terminal resistance in the output stage circuit, so the power consumption of the circuit is much lower than that of the traditional circuit.

Abstract: A laser driver with high-speed and high-current and current modulating method thereof is invented. The laser driver includes a first driving unit and a second driving unit, each driving unit including a pre-drive amplifier circuit and a main drive amplifier circuit. The pre-drive amplifier circuit includes a first differential transistor pair circuit, a differential voltage conversion circuit, a DC common mode level reduction circuit and a first cascode current mirror circuit. The main drive amplifier circuit includes a second differential transistor pair circuit, a bandwidth boost circuit, a matching circuit and a second cascode current mirror circuit. The present invention avoids the enhancement of chip area caused by the use of passive inductors peaking mode to enhance bandwidth, and reduces the cost of chip, design complexity and circuit power consumption.