Bi-Directional Single-Ended Transmission Systems

Patent metadata

Field	Value
Publication number	US-2022038130-A1
Application number	US-202016983619-A
Country	US
Kind code	A1
Filing date	Aug 3, 2020
Priority date	Aug 3, 2020
Publication date	Feb 3, 2022
Grant date	—

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

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 transmitter with a first differential output terminal and a second differential output terminal, wherein the first differential output terminal is coupled to a first node and the second differential output terminal is coupled to a second node; a receiver with single-ended input terminal coupled to a third node; and an inductor and a resistor connected in series between the first node and the third node.

9 . The system of claim 8 , wherein the second node is isolated from the third node.

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

11 . The system of claim 10 , wherein the amplifier comprises:
an operational amplifier.

12 . The system of claim 8 , comprising:
a coaxial cable connector with a first conductor coupled to the first node.

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

14 . The system of claim 8 , wherein the transmitter is configured to operate at a higher carrier frequency than the receiver.

15 . The system of claim 8 , wherein the transmitter is configured to transmit CoaXPress high-speed downlink signals and the receiver is configured to receive CoaXPress low-speed uplink signals.

16 . 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.

17 . The system of claim 16 , wherein the fourth node is isolated from the sixth node.

18 . The system of claim 16 , 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.

19 . The system of claim 18 , 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.

20 . The system of claim 16 , comprising:
an amplifier coupling the sixth node to the input terminal.

21 . The system of claim 16 , comprising:
a power-over-coax direct current injector coupled to the first node.

22 . The system of claim 16 , comprising:
a power-over-coax direct current extractor coupled to the third node.

23 . The system of claim 16 , 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.

24 . The system of claim 16 , 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.

Assignees

• Apple Inc

Inventors

• Kim Heegon
• Rajagopal Abhilash
• Bouadjel Samir

Classifications

• H04L25/028 Primary

  Arrangements specific to the transmitter end · CPC title

• H04B1/40 Primary

  Circuits · CPC title

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H04L25/0292

  Arrangements specific to the receiver end · CPC title

• H03F3/45475

  using IC blocks as the active amplifying circuit · CPC title