Optical isolator life expander

Patent metadata

Field	Value
Publication number	US-9306662-B1
Application number	US-201314140754-A
Country	US
Kind code	B1
Filing date	Dec 26, 2013
Priority date	Apr 12, 2013
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A system includes a light emitting device on a first side of electrically isolated circuitry for transmitting an optical signal to a second side of the electrically isolated circuitry. The system also includes a driver for driving the light emitting device at an operational characteristic. The system further includes an optical receiver on the second side of the electrically isolated circuitry for receiving the optical signal from the light emitting device. The system also includes a sensor coupled with the optical receiver for sampling the intensity of the optical signal received by the optical receiver. The sensor is communicatively coupled with the driver and configured to transmit the sampled intensity of the optical signal received from the light emitting device to the driver, and the driver is configured to adjust the operational characteristic of the light emitting device based upon the sampled intensity of the optical signal.

First claim

What is claimed is:

1. A system comprising: a light emitting diode on a first side of electrically isolated circuitry for transmitting an optical signal to a second side of the electrically isolated circuitry; a driver for driving the light emitting diode with an “ON” time; an optical receiver on the second side of the electrically isolated circuitry for receiving the optical signal from the light emitting diode; a sensor coupled with the optical receiver for sampling the intensity of the optical signal received by the optical receiver, wherein the sensor is communicatively coupled with the driver and configured to transmit the sampled intensity of the optical signal received from the light emitting diode to the driver, and the driver is configured to adjust the “ON” time based upon the sampled intensity of the optical signal; and a sigma-delta modulator and an oscillator disposed on the first side of the electrically isolated circuitry and configured to provide a clock signal to the light emitting diode.

2. The system as recited in claim 1 , further comprising an optical link communicatively coupling the sensor with the driver.

3. The system as recited in claim 1 , further comprising clock and data recovery circuitry disposed on the second side of the electrically isolated circuitry and configured to receive the clock signal.

4. The system as recited in claim 1 , wherein the sensor comprises a current sensor.

5. The system as recited in claim 4 , wherein the current sensor comprises an analog-to-digital converter.

6. The system as recited in claim 1 , wherein the “ON” time comprises a pulse width of the light emitting diode.

7. The system as recited in claim 1 , wherein the driver is configured to adjust an amplitude of the light emitting diode based upon the sampled intensity of the optical signal.

8. A system comprising: a light emitting device on a first side of electrically isolated circuitry for transmitting an optical signal to a second side of the electrically isolated circuitry; a driver for driving the light emitting device with an “ON” time; an optical receiver on the second side of the electrically isolated circuitry for receiving the optical signal from the light emitting device; a current sensor coupled with the optical receiver for sampling the intensity of the optical signal received by the optical receiver; an optical link communicatively coupling the sensor with the driver, wherein the sensor is configured to transmit the sampled intensity of the optical signal received from the light emitting device to the driver, and the driver is configured to adjust the “ON” time based upon the sampled intensity of the optical signal; and a sigma-delta modulator and an oscillator disposed on the first side of the electrically isolated circuitry and configured to provide a clock signal to the light emitting device.

9. The system as recited in claim 8 , further comprising clock and data recovery circuitry disposed on the second side of the electrically isolated circuitry and configured to receive the clock signal.

10. The system as recited in claim 8 , wherein the current sensor comprises an analog-to-digital converter.

11. The system as recited in claim 8 , wherein the “ON” time comprises a pulse width of the light emitting device.

12. The system as recited in claim 8 , wherein the operational characteristic comprises an amplitude of the light emitting device.

13. A chip package comprising:
a first integrated circuit chip comprising a light emitting device on a first side of electrically isolated circuitry for transmitting an optical signal to a second side of the electrically isolated circuitry, a driver for driving the light emitting device with an “ON” time, and an optical receiver on the second side of the electrically isolated circuitry for receiving the optical signal from the light emitting device;
a second integrated circuit chip comprising a sensor coupled with the optical receiver for sampling the intensity of the optical signal received by the optical receiver, wherein the sensor is communicatively coupled with the driver and configured to transmit the sampled intensity of the optical signal received from the light emitting device to the driver, and the driver is configured to adjust the “ON” time based upon the sampled intensity of the optical signal and
a third integrated circuit chip comprising a sigma-delta modulator and an oscillator disposed on the first side of the electrically isolated circuitry and configured to provide a clock signal to the light emitting device.

14. The chip package as recited in claim 13 , wherein the second integrated circuit chip further comprises clock and data recovery circuitry disposed on the second side of the electrically isolated circuitry and configured to receive the clock signal.

15. The chip package as recited in claim 13 , wherein the sensor comprises a current sensor.

16. The chip package as recited in claim 13 , wherein the “ON” time comprises a pulse width of the light emitting device.

17. The chip package as recited in claim 13 , wherein the driver is configured to adjust an amplitude of the light emitting device based upon the sampled intensity of the optical signal.

Assignees

• Maxim Integrated Products

Inventors

• Hematy Arman

Classifications

• H04B10/075 Primary

  using an in-service signal (H04B10/071 takes precedence) · CPC title

• H04B10/802 Primary

  for isolation, e.g. using optocouplers · CPC title