Patent ID: 9654221
Date: 2017-05-16
CPC Classifications: G02F,H03M,H04B

Claim:
1. A single chip dual-channel driver for two independent traveling wave modulators, the driver comprising: two differential pairs of inputs per channel respectively configured to receive two digital differential pair signals; a two-bit Digital-to-Analog Convertor (DAC) per channel coupled to the two differential pairs of inputs to convert the two digital differential pair signals to single analog differential pair PAM signal at a differential pair output with two single ended swing voltages respectively outputted to two near ends of two waveguides of a traveling wave modulator associated with the channel and terminated at corresponding two far ends with a pair of matched resistors; a control block including internal voltage/current signal generators configured to receive control signals from the DAC for providing a tail current control, a dither signal to assist modulation control per channel; and an I2C communication block coupled to a high-speed clock generator to generate the control signals sent via the DAC to the control block and coupled to host via an I2C digital communication interface and configured to provide a variety of internal set points including at least an output swing adjustment ratio per channel, a bias voltage level, and a dither swing voltage per channel.