Photonic transmitter drivers with logic using cascaded differential transistor pairs stepped by supply voltage differences

A driver circuit comprising:

• digital inputs connected to external multiplexors and buffers, wherein the digital inputs comprise a first digital input and a second digital input;
• a clock input;
• an analog output connected to an external laser-supplied transmission modulator;
• a first differential pair of transistors connected to the analog output, wherein gates of the first differential pair of transistors are connected to the first digital input;
• second differential pairs of transistors connected to the analog output, wherein gates of the second differential pairs of transistors are connected to at least the second digital input;
• and
• voltage limiters comprising transistors connected to the clock input and the second differential pairs of transistors, and
• wherein the second differential pairs of transistors provide analog signals to the analog output.

A driver circuit comprising:

• digital inputs connected to external multiplexors and buffers, wherein the digital inputs comprise a first digital input and a second digital input, wherein the first digital input receives first true data D1 and first complement data D1, wherein the second digital input receives second true data D2 and second complement data D2;
• a clock input;
• an analog output connected to an external laser-supplied transmission modulator;
• a first differential pair of transistors M1, M2, connected to the first digital input and the analog output,
• second differential pairs of transistors M3, M4, and M5, M6 connected to the second digital input and the analog output;
• and
• voltage limiters comprising transistors, M7, M8 connected to the first digital input, the clock input, and the second differential pairs of transistors,
• wherein a source of M7 is connected to sources of M3, M4 and a source of M8 is connected to sources of M5, M6, and
• wherein the second differential pairs of transistors provide analog signals to the analog output.