Drivers having T-coil structures

Patent metadata

Field	Value
Publication number	US-9197195-B2
Application number	US-201414520646-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Oct 21, 2011
Publication date	Nov 24, 2015
Grant date	Nov 24, 2015

Abstract

A driver includes a first driver stage having a first T-coil structure. The first T-coil structure includes a first set of inductors each being operable to provide a first inductance. The first T-coil structure further includes a second set of inductors electrically coupled with the first set of inductors, wherein the second set of inductors each are operable to provide a second inductance.

First claim

What is claimed is:

1. A driver comprising:
a first driver stage having a first T-coil structure, the first T-coil structure comprising:
a first set of inductors each being operable to provide a first inductance; and
a second set of inductors electrically coupled in parallel with the first set of inductors, wherein the second set of inductors each are operable to provide a second inductance.

2. The driver of claim 1 , further comprising a capacitor connected in parallel with the first set of inductors and in parallel with the second set of inductors.

3. The driver of claim 1 , further comprising a resistor, wherein a first end of the resistor is electrically connected to the first set of inductors and to the second set of inductors, and a second end of the resistor is configured to receive a power voltage.

4. The driver of claim 1 , further comprising a transistor, wherein a first terminal of the transistor is electrically connected to the first set of inductors and to the second set of inductors, and a second terminal of the transistor is connected to a current source.

5. The driver of claim 4 , further comprising an inductor between the transistor and both of the first set of inductors and the second set of inductors.

6. The driver of claim 1 , further comprising a second driver stage electrically connected to the first driver stage, wherein an input node of the second driver stage is connected to a node between a first inductor of the first set of inductors and a second inductor of the first set of inductors.

7. The driver of claim 1 , further comprising a second T-coil structure, the second T-coil structure comprising:
a third set of inductors each being operable to provide a third inductance; and
a fourth set of inductors electrically coupled with the third set of inductors, wherein the fourth set of inductors each are operable to provide a fourth inductance.

8. The driver of claim 7 , further comprising a second driver stage electrically connected to the first driver stage, wherein a first input node of the second driver stage is connected to a node between a first inductor of the first set of inductors and a second inductor of the first set of inductors, and a second input node of the second driver stage is connected to a node between a first inductor of the third set of inductors and a second inductor of the third set of inductors.

9. The driver of claim 7 , further comprising:
a first resistor between a first power voltage and both of the first set of inductors and the second set of inductors; and
a second resistor between a second power voltage and both of the third set of inductors and the fourth set of inductors.

10. The driver of claim 9 , wherein the first power voltage is different from the second power voltage.

11. A driver comprising:
a first driver stage having a first T-coil structure, wherein the first T-coil structure comprises:
a first set of inductors each being operable to provide an inductance of about 0.2 nanohenries (nH) or more and a coupling coefficient of about 0.5; and
a second set of inductors electrically coupled in parallel with the first set of inductors, wherein the second set of inductors each are operable to provide an inductance of about 0.2 nH or more.

12. The driver of claim 11 , wherein a first node between a first inductor of the first set of inductors and a second inductor of the first set of inductors is electrically connected to a second node between a first inductor of the second set of inductors and a second inductor of the second set of inductors.

13. The driver of claim 12 , further comprising a second driver stage electrically connected to the first driver stage, wherein an input node of the second driver stage is electrically connected to the first node.

14. The driver of claim 13 , wherein the second driver stage comprises a plurality of transistors connected in series between a first power voltage and a current source.

15. The driver of claim 14 , wherein a gate of a first transistor of the plurality of transistors is electrically connected to the input node, a gate of a second transistor of the plurality of transistors is configured to receive the first power voltage, and a gate of a third transistor of the plurality of transistors is configured to receive a second power voltage.

16. The driver of claim 15 , wherein the first power voltage is different from the second power voltage.

17. A driver comprising:
a first driver stage having T-coil structures, the T-coil structures each comprising:
a plurality of sets of inductors that are electrically coupled with each other, wherein each set of inductors of the plurality of sets of inductors is operable to provide a coupling coefficient of about 0.5, and a first inductor of a first set of inductors of the plurality of sets of inductors is coupled in parallel with a second inductor of a second set of inductors of the plurality of sets of inductors.

18. The driver of claim 17 , wherein the first driver stage further comprises a plurality of transistors, wherein each transistor of the plurality of transistors is electrically connected to a corresponding T-coil structure of the T-coil structures.

19. The driver of claim 18 , wherein the first driver stage further comprises a plurality of inductors, wherein each inductor of the plurality of inductors is connected between a transistor of the plurality of transistors and a corresponding T-coil structure of the T-coil structures.

20. The driver of claim 17 , wherein the T-coil structures each further comprise a capacitor electrically connected to the plurality of sets of inductors.

Assignees

• Taiwan Semiconductor Mfg

Inventors

• Huang Ming-Chieh
• Chung Tao Wen
• Chern Chan-Hong
• Lin Chih-Chang
• Swei Yuwen
• Pu Chiang

Classifications

• H03H11/44 Primary

  Negative impedance converters (H03H11/42 takes precedence) · CPC title

• H04B10/504 Primary

  using direct modulation · CPC title

• H01S5/0427

  for applying modulation to the laser · CPC title