Crystal oscillator circuit on PCB, PCB and server

Patent metadata

Field	Value
Publication number	US-12376223-B2
Application number	US-202118246292-A
Country	US
Kind code	B2
Filing date	Jun 29, 2021
Priority date	Sep 27, 2020
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The present disclosure discloses a crystal oscillator circuit on a PCB. The crystal oscillator circuit includes a crystal oscillator including an input end, an output end, a first grounding end and a second grounding end; a first capacitor with one end connected to the input end; and a second capacitor with one end connected to the output end, wherein the first grounding end is connected to a first grounding hole, the second grounding end is connected to a second grounding hole, the other end of the first capacitor is connected to a third grounding hole, the other end of the second capacitor is connected to a fourth grounding hole. The present disclosure further discloses the PCB and a server.

First claim

What is claimed is:

1. A crystal oscillator circuit on a PCB, comprising:
a crystal oscillator comprising an input end, an output end, a first grounding end and a second grounding end;
a first capacitor with one end connected to the input end; and
a second capacitor with one end connected to the output end,
wherein the first grounding end is connected to a first grounding hole, the second grounding end is connected to a second grounding hole, the other end of the first capacitor is connected to a third grounding hole, and the other end of the second capacitor is connected to a fourth grounding hole; and
the first grounding hole, the second grounding hole, the third grounding hole and the fourth grounding hole are independent of one another and are not in ground connection to a motherboard on a layer where the crystal oscillator circuit is located;
the crystal oscillator circuit on the PCB further comprises:
a first differential signal line connected to one end of the first capacitor;
a second differential signal line connected to one end of the second capacitor;
and a guard trace constructed to surround the crystal oscillator, the first capacitor, the second capacitor, the first differential signal line and the second differential signal line,
wherein the guard trace is provided with a plurality of fifth grounding holes;
wherein the guard trace comprises a first part, a second part and a third part, wherein the first part and the second part are located on two sides of the crystal oscillator,
widths of the first part and widths of the second part are within a third preset interval range,
the third part is located below the crystal oscillator,
and a width of the third part is not less than the width of the first part or the width of the second part.

2. The crystal oscillator circuit as claimed in claim 1 , wherein a distance between the first capacitor and the crystal oscillator and a distance between the second capacitor and the crystal oscillator are within a first preset interval range.

3. The crystal oscillator circuit as claimed in claim 1 , wherein the guard trace is not connected to the first grounding hole, the second grounding hole, the third grounding hole and the fourth grounding hole, and is not in ground connection to a motherboard on a layer where the crystal oscillator circuit is located.

4. The crystal oscillator circuit as claimed in claim 1 , wherein a distance between every two adjacent fifth grounding holes is within a second preset interval range.

5. The crystal oscillator circuit as claimed in claim 1 , wherein a distance between the first part and the first differential signal line is within a fourth preset interval range, a distance between the second part and the second differential signal line is within the fourth preset interval range, a distance between the first part and other signal lines or a ground wire of the layer where the crystal oscillator circuit is located is within the fourth preset interval range, and a distance between the second part and other signal lines or the ground wire of the layer where the crystal oscillator circuit is located is within the fourth preset interval range.

6. The crystal oscillator circuit as claimed in claim 1 , wherein a corner of the third part is greater than a preset value, or the corner of the third part is in an arc shape.

7. The crystal oscillator circuit as claimed in claim 1 , wherein the first capacitor, the second capacitor, the crystal oscillator and circuits corresponding to a control chip are placed on the same layer.

8. The crystal oscillator circuit as claimed in claim 1 , wherein a resistor is added behind the first capacitor and the second capacitor to be connected between an input line of the crystal oscillator and an output line of the crystal oscillator.

9. The crystal oscillator circuit as claimed in claim 1 , wherein the guard trace of the crystal oscillator and a GND of a PCB are subjected to low-impedance lap joint through the plurality of fifth grounding holes.

10. The crystal oscillator circuit as claimed in claim 1 , wherein the crystal oscillator is placed in the middle of a PCB, the width of the third part is the same with the width of the first part and the width of the second part, when the crystal oscillator is placed on the edge of the PCB, the width of the third part is greater than the width of the first part and the width of the second part.

11. A PCB, comprising a crystal oscillator circuit, wherein the crystal oscillator circuit comprising:
a crystal oscillator comprising an input end, an output end, a first grounding end and a second grounding end;
a first capacitor with one end connected to the input end; and
a second capacitor with one end connected to the output end,
wherein the first grounding end is connected to a first grounding hole, the second grounding end is connected to a second grounding hole, the other end of the first capacitor is connected to a third grounding hole, and the other end of the second capacitor is connected to a fourth grounding hole; and
the first grounding hole, the second grounding hole, the third grounding hole and the fourth grounding hole are independent of one another and are not in ground connection to a motherboard on a layer where the crystal oscillator circuit is located;
the crystal oscillator circuit further comprises:
a first differential signal line connected to one end of the first capacitor;
a second differential signal line connected to one end of the second capacitor;
and a guard trace constructed to surround the crystal oscillator, the first capacitor, the second capacitor, the first differential signal line and the second differential signal line,
wherein the guard trace is provided with a plurality of fifth grounding holes;
wherein the guard trace comprises a first part, a second part and a third part,
wherein the first part and the second part are located on two sides of the crystal oscillator,
widths of the first part and widths of the second part are within a third preset interval range,
the third part is located below the crystal oscillator,
and a width of the third part is not less than the width of the first part or the width of the second part.

12. The PCB as claimed in claim 11 , wherein a distance between the first capacitor and the crystal oscillator and a distance between the second capacitor and the crystal oscillator are within a first preset interval range.

13. The PCB as claimed in claim 11 , wherein the guard trace is not connected to the first grounding hole, the second grounding hole, the third grounding hole and the fourth grounding hole, and is not in ground connection to a motherboard on a layer where the crystal oscillator circuit is located.

14. The PCB as claimed in claim 11 , wherein a distance between every two adjacent fifth grounding holes is within a second preset interval range.

15. The PCB as claimed in claim 11 , wherein a distance between the first part and the first differential signal line is within a fourth preset interval range, a distance between the second part and the second differential signal line is within the fourth preset interval range, a distance between the first part and other signal lines or a ground wire of the layer where the crystal oscillator circuit is located is within the fourth preset interval range, and a distance between the second part and other signal lines or the ground wire of the layer where the crystal oscillator circuit is located is within the fourth preset interval range.

16. A server, comprising a crystal oscillator circuit, wherein the crystal osc

Assignees

• Inspur Suzhou Intelligent Technology Co Ltd

Inventors

• Tian Liliang

Classifications

• H05K2201/10287

  Metal wires as connectors or conductors · CPC title

• H05K2201/10075

  Non-printed oscillator · CPC title

• H05K2201/09218

  Conductive traces · CPC title

• H05K1/0215

  Grounding of printed circuits by connection to external grounding means · CPC title

• H03B5/18 Primary

  with frequency-determining element comprising distributed inductance and capacitance · CPC title