Optical modulator driver

摘要

In the optical modulator driver, a plurality of differential amplifiers are arranged in one direction, and input terminals and output terminals of each adjacent differential amplifier are connected via independent wirings. Each differential amplifier includes a differential pair and a series circuit. In the series circuit, a resistor, a capacitor, and a resistor are connected in series. The series circuit is provided between emitters of two transistors of the differential pair, one of the differential input terminals of the differential amplifier and one transistor of the differential pair are connected via a resistor, and the other of the differential input terminals of the differential amplifier and the other transistor of the differential pair are connected via a resistor.

主权项

1. An optical modulator driver for generating a driving signal from an input signal, comprising:
an input transmission line configured to externally receive the input signal at one end thereof and configured to transmit the input signal; differential amplifiers each having,
an input terminal and an output terminal, the input terminal being configured to receive the input signal from the input transmission line,a differential pair including a pair of transistors, a first resistor and a second resistor, the transistors having emitters connected to each other through the first and second resistors, and collectors generating an amplified signal to be output from the output terminal,a series circuit including a third resistor, a fourth resistor, and a first capacitor, the third resistor in one end thereof being connected to one end of the fourth resistor through the first capacitor, the third resistor in another end thereof being connected to the emitter of one of the transistors, the fourth resistor in another end thereof being connected to the emitter of the other of the transistors, anda resister part including at least one input resistor, the resistor part coupling the input terminal to the differential pair for providing the input signal to the pair of transistors; andan output transmission line configured to receive the amplified signals output from the output terminals of the differential amplifiers and output the driving signal at one end thereof as a sum of the amplified signals.