Bi-directional single-ended transmission systems

Patent metadata

Field	Value
Publication number	US-11405068-B2
Application number	US-202016983619-A
Country	US
Kind code	B2
Filing date	Aug 3, 2020
Priority date	Aug 3, 2020
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

Systems for bi-directional single-ended transmission are described. For example, a system may include a receiver with a first differential input terminal and a second differential input terminal, wherein the first differential input terminal is coupled to a first node and the second differential input terminal is coupled to a second node; a transmitter with an output terminal coupled to a third node; a first inductor connected between the first node and the third node; a second inductor connected between the second node and the third node; and a shunt resistor connected between the third node and a ground node.

First claim

What is claimed is:

1. A system comprising:
a receiver with a first differential input terminal and a second differential input terminal, wherein the first differential input terminal is coupled to a first node and the second differential input terminal is coupled to a second node;
a transmitter with an output terminal coupled to a third node;
a first inductor connected between the first node and the third node;
a second inductor connected between the second node and the third node; and
a shunt resistor connected between the third node and a ground node.

2. The system of claim 1 , comprising:
a high-pass filter coupling the first differential input terminal to the first node and coupling the second differential input terminal to the second node.

3. The system of claim 2 , wherein the high-pass filter comprises:
a first capacitor connected between the first differential input terminal and the first node; and
a second capacitor connected between the second differential input terminal and the second node.

4. The system of claim 1 , comprising:
a coaxial cable connector with a first conductor coupled to the first node.

5. The system of claim 1 , comprising:
a power-over-coax direct current injector coupled to the first node.

6. The system of claim 1 , wherein the receiver is configured to operate at a higher carrier frequency than the transmitter.

7. The system of claim 1 , wherein the receiver is configured to receive CoaXPress high-speed downlink signals and the transmitter is configured to transmit CoaXPress low-speed uplink signals.

8. A system comprising:
a coaxial cable including an inner conductor and an outer conductor;
a first receiver with a first differential input terminal and a second differential input terminal, wherein the first differential input terminal is coupled to a first node, which is coupled to the inner conductor, and the second differential input terminal is coupled to a second node;
a first transmitter with a first differential output terminal and a second differential output terminal, wherein the first differential output terminal is coupled to a third node, which is coupled to the inner conductor, and the second differential output terminal is coupled to a fourth node;
a second transmitter with an output terminal coupled to a fifth node;
a first inductor connected between the first node and the fifth node;
a second inductor connected between the second node and the fifth node;
a first resistor connected between the fifth node and a ground node;
a second receiver with an input terminal coupled to a sixth node; and
a third inductor and a second resistor connected in series between the third node and the sixth node.

9. The system of claim 8 , wherein the fourth node is isolated from the sixth node.

10. The system of claim 8 , comprising:
a high-pass filter coupling the first differential input terminal to the first node and coupling the second differential input terminal to the second node.

11. The system of claim 10 , wherein the high-pass filter comprises:
a first capacitor connected between the first differential input terminal and the first node; and
a second capacitor connected between the second differential input terminal and the second node.

12. The system of claim 8 , comprising:
an amplifier coupling the sixth node to the input terminal.

13. The system of claim 8 , comprising:
a power-over-coax direct current injector coupled to the first node.

14. The system of claim 8 , comprising:
a power-over-coax direct current extractor coupled to the third node.

15. The system of claim 8 , wherein the first transmitter and the first receiver are configured to operate at a higher carrier frequency than the second transmitter and the second receiver.

16. The system of claim 8 , wherein the first transmitter and the first receiver are configured to transfer CoaXPress high-speed downlink signals and the second transmitter and the second receiver are configured to transmit CoaXPress low-speed uplink signals.

17. The system of claim 12 , wherein the amplifier comprises:
an operational amplifier.

Assignees

• Apple Inc

Inventors

• Kim Heegon
• Rajagopal Abhilash
• Bouadjel Samir

Classifications

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H03H7/0138

  Electrical filters or coupling circuits · CPC title

• H04L25/0292

  Arrangements specific to the receiver end · CPC title

• H04L25/0272

  Arrangements for coupling to multiple lines, e.g. for differential transmission · CPC title

• H04L25/028 Primary

  Arrangements specific to the transmitter end · CPC title