Modulation drive output stage circuit

Abstract

The invention provides a modulation driving output stage circuit. The modulation driving output stage circuit comprises a switch control circuit part and a current generation circuit part. The modulation driving output stage circuit receives a pair of difference input voltages and outputs a pair of difference output currents. The current generation circuit part comprises a first transistor, a second transistor, a first reference current source and a second reference current source. The switch control circuit part comprises a third transistor, a fourth transistor, a first phase inverter and a second inverter. The first difference voltage in the pair of difference input voltages is input into the grid electrode of the third transistor through the first phase inverter, the second difference voltage in the pair of difference input voltages is input into the grid electrode of the fourth transistor through the second phase inverter, the drain electrode of the second transistor outputs the first difference current in the pair of difference output currents, and the drain electrode of the first transistor outputs the second difference current in the pair of difference output currents. The modulation driving output stage circuit can increase the voltage margin of a driver.

Description

technical field [0001] The invention relates to a modulation driving circuit, in particular to a modulation driving output stage circuit applied in a laser driver. Background technique [0002] With the advancement of science and technology, optical fiber communication has entered various fields of wired communication and has become the mainstream of communication development. To realize optical fiber network communication, the first problem to be solved is how to load the signal to the optical fiber channel, that is, optical modulation is required. [0003] The simplest and most widely used modulation strategy is on-off keying (OOK, on-offkeying) modulation, that is, the beam is turned on or off according to whether the input data is logic "1" or logic "0". There are two ways to realize the OOK modulation signal, that is, external modulation and direct modulation. External modulation is to use an external modulator to change the stable optical power output by the laser to...

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Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a modulating drive output stage circuit, which can increase the voltage margin of the driver, so as to avoid the driver from causing insufficient margin when the power supply voltage is low. The problem of transistors not being able to switch quickly

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