Reducing power noise in differential drivers

• US 20070139079A1
• Filed: 12/20/2005
• Published: 06/21/2007
• Est. Priority Date: 12/20/2005
• Status: Abandoned Application

• Current Assignee: LSI Corporation (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Tang, George
• Application Number:
  US11/314,855
• Publication Number:
  US 20070139079A1
• Time in Patent Office: Days
• US Class Current: 326/87
• CPC Class Codes: H03K 19/00361 in field effect transistor circuits

Abstract

An improvement reducing or eliminating noise between drivers connected in common on a single chip. A DC power source (VDD1) providing a common signal to multiple PCML drivers and inductance introduced between a common DC power source and each of the multiple PCML drivers tied in common to the DC power source. The introduced inductance between VDD1 and each of the multiple PCML drivers reduces or eliminates AC noise from flowing between drivers and allows DC signaling to pass to all drivers commonly connected to VDD1.

Claims

1. A driver circuit comprising inductance introduced between a DC power source providing a common signal to multiple drivers and each of the multiple drivers, wherein the introduced inductance between the DC power source and each of the multiple drivers reduces or eliminates AC noise from flowing between drivers and allows DC signaling to pass to all drivers commonly connected to the DC power source.

2. The driver circuit of claim 1 wherein said driver circuit reduces noise between drivers connected in common on a single chip.

3. The driver circuit of claim 1 wherein said multiple drivers are PCML drivers.

4. The driver circuit of claim 3 wherein said driver circuit reduces noise between drivers connected in common on a single chip.

5. The driver circuit of claim 2 wherein said multiple drivers are PCML drivers.

6. A driver circuit reducing or eliminating noise between drivers connected in common, comprising:

access to a DC power source providing a common signal to multiple PCML drivers; and

inductance introduced between the DC power source and each of the multiple PCML drivers;

wherein the introduced inductance between the DC power source and each of the multiple PCML drivers reduces or eliminates AC noise from flowing between drivers and allows DC signaling to pass to all drivers commonly connected to the DC power source.

7. The driver circuit of claim 6 wherein said driver circuit reduces noise between drivers connected in common on a single chip.

8. The driver circuit of claim 6 wherein said multiple drivers are PCML drivers.

9. The driver circuit of claim 8 wherein said driver circuit reduces noise between drivers connected in common on a single chip.

10. The driver circuit of claim 7 wherein said multiple drivers are PCML drivers.

11. A driver circuit reducing or eliminating noise between PCML drivers connected in common on a single chip, comprising:

a DC power source providing a common VDD1 signal to multiple PCML drivers; and

added inductance between VDD1 and each of the multiple PCML drivers;

wherein the added inductance between VDD1 and each of the multiple PCML drivers reduces or eliminates AC noise from flowing between drivers and allows DC signaling to pass to all drivers commonly connected to VDD1.