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US 11,537,185 B2Granted
Common-mode voltage control for high-speed transceivers
AssigneeDiodes Incorporated
InventorHung-Yan Cheung
Life of this patent
Estimating the term…
Abstract
Circuits and techniques are described for high-speed transceivers (e.g., repeaters such as re-drivers or re-timers) that ensure that the instantaneous voltage at an input or output of a connected device remains within a desired or specified voltage range.
Claims20
A device, comprising:
- a first receive port configured to receive a first signal from a first device;
- first circuitry configured to process the first signal to restore one or more aspects of the first signal thereby generating a second signal;
- a first transmit port configured to transmit the second signal to a second device via a first coupling capacitor,
- an external capacitor node configured for connection to an external capacitor, the external capacitor node being connected to the first transmit port;
- a supply voltage node configured for connection to a supply voltage;
- and
- second circuitry configured to cause, in response to detecting that the supply voltage has dropped below a threshold, a transmit node associated with the first transmit port to transition to a high impedance state and to control a connection between the external capacitor node and the supply voltage node such that the external capacitor node is disconnected from the supply voltage node, wherein the threshold represents an instantaneous voltage at an input of the second device that is within a voltage range specified by a serial data transmission protocol.
4 more elements
A system, comprising:
- a first device;
- a second device;
- and
- a serial data interface connecting the first and second devices, the serial data interface including a repeater, the repeater including:
- a first receive port configured to receive a first signal from the first device;
- first circuitry configured to process the first signal to restore one or more aspects of the first signal thereby generating a second signal;
- a first transmit port configured to transmit the second signal to the second device via a first coupling capacitor,
- an external capacitor connected to an external capacitor node and the first transmit port;
- a supply voltage node connected to a supply voltage;
- and
- second circuitry configured to cause, in response to detecting that the supply voltage has dropped below a threshold, a transmit node associated with the first transmit port to transition to a high impedance state and to control a connection between the external capacitor node and the supply voltage node such that the external capacitor node is disconnected from the supply voltage node, wherein the threshold represents an instantaneous voltage at an input of the second device that is within a voltage range specified by a serial data transmission protocol.
8 more elements
A device, comprising:
- a receive port configured to receive a first signal from a first device;
- first circuitry configured to process the first signal to restore one or more aspects of the first signal thereby generating a second signal;
- a transmit port configured to transmit the second signal to a second device via a coupling capacitor,
- an external capacitor node configured for connection to an external capacitor, the external capacitor node being connected to the transmit port;
- a supply voltage node configured for connection to a supply voltage;
- and
- second circuitry configured to cause, in response to detecting that the supply voltage has dropped below a threshold, a transmit node associated with the first transmit port to transition to a high impedance state and to control a connection between the external capacitor node and the supply voltage node such that the external capacitor node is disconnected from the supply voltage node, wherein the threshold represents an instantaneous voltage at an input of the second device that is above a lower end of a voltage range specified by a version of the Universal Serial Bus specification.
4 more elements
Dependencies are inferred from the claim text.