High-speed serial data signal transmitter driver circuitry
AssigneeAltera Corporation
InventorsWilson Wong, Allen Chan, Sergey Shumarayev, Weiqi Ding
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Abstract
Transmitter driver circuitry for outputting a high-speed serial data signal (e.g., in the range of about 10 gigabits per second or higher) includes H-tree driver circuitry having only a main driver stage and a post-tap driver stage. At least one transistor in the H-tree driver circuitry is constructed and connected to provide electrostatic discharge protection. PMOS and NMOS current sources are used for the H-tree driver circuitry to enhance power supply noise rejection.
Claims17
Transmitter driver circuitry for outputting a high speed serial data signal having a serial bit rate in the range of about 10 Gbps comprising:
- H-tree driver circuitry having only a main driver stage and a post-tap driver stage.
High-speed serial data signal transmitter driver circuitry comprising:
- a voltage-dividing resistor pair connected in series between first and second output terminals;
- a main driver stage comprising first and second current sources, a first PMOS transistor connected in series between the first current source and the first output terminal, a second PMOS transistor connected in series between the first current source and the second output terminal, a first NMOS transistor connected in series between the first output terminal and the second current source, and a second NMOS transistor connected in series between the second output terminal and the second current source;
- and
- a post driver stage comprising third and fourth current sources, a third PMOS transistor connected in series between the third current source and the first output terminal, a fourth PMOS transistor connected in series between the third current source and the second output terminal, a third NMOS transistor connected in series between the first output terminal and the fourth current source, and a fourth NMOS transistor connected in series between the second output terminal and the fourth current source;
- wherein the main and post driver stages are the only driver stages connected to the output terminals.
Transmitter driver circuitry for outputting a high speed serial data signal comprising:
- a main H-tree driver stage connected to a pair of differential output terminals, a voltage-dividing resistor pair being connected between said terminals;
- and
- a post-tap H-tree driver stage connected in parallel with the main H-tree driver stage to said terminal, said main and post-tap H-tree driver stages being the only driver stages connected to said terminals.
Dependencies are inferred from the claim text.