Opto-isolator with correction circuit
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsGopinath Maasi, Thiam Siew Tay, Soo Kiang Ho, Peng Siang Seet
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Abstract
An opto-isolator with a correction circuit is disclosed. The correction circuit is configured to make adjustments for degradation of the light source of the opto-isolator. The correction circuit may comprise a photodetector for detecting degradation of the light source of the opto-isolator. When the light source degrades below a predetermined level, the correction circuit may be configured to make adjustments.
Claims21
An opto-isolator for electrical isolation of an electrical input signal from an electrical output signal comprising:
- a signal input terminal configured to receive the electrical input signal;
- an optical emitter coupled to the signal input terminal and configured to generate emitted light in response to the electrical input signal;
- a first optical receiver comprising a first photodetector arranged proximate to the optical emitter to receive a first portion of the emitted light, wherein the first optical receiver is configured to generate the electrical output signal in response to the emitted light;
- a signal output terminal coupled to the first optical receiver to receive the electrical output signal;
- a second optical receiver comprising a second photodetector arranged proximate to the optical emitter to receive a second portion of the emitted light, wherein the second optical receiver is configured to generate a light output electrical signal in response to the second portion of the emitted light, wherein the second optical receiver comprises:
- a first reference signal generator configured to generate a first reference signal;
- and
- a first comparator coupled with the first reference signal generator and the second photodetector, and configured to generate a first comparison signal in response to the first reference signal and the light output electrical signal;
- a correction circuitry coupled with the second optical receiver, the correction circuitry configured to make adjustments when the optical emitter degrades;
- and
- a threshold correction signal generator coupled with the first comparator and configured to generate a threshold correction signal in response the first comparison signal.
An opto-isolator for electrical isolation of an electrical input signal from an electrical output signal comprising:
- a signal input terminal configured to receive the electrical input signal;
- an optical emitter coupled to the signal input terminal and configured to generate emitted light in response to the electrical input signal;
- a first photodetector arranged proximate to the optical emitter to receive a first portion of the emitted light, wherein the first photodetector is configured to generate the electrical output signal in response to the emitted light;
- a signal output terminal coupled to the first photodetector to receive the electrical output signal;
- a second photodetector arranged proximate to the optical emitter to receive a second portion of the emitted light, wherein the second photodetector is configured to generate a light output electrical signal in response to the second portion of the emitted light;
- a first reference signal generator configured to generate a first reference signal;
- and
- a first comparator coupled with the first reference signal generator and the second photodetector, and configured to generate a first comparison signal in response to the first reference signal and the light output electrical signal;
- a correction circuitry coupled with the second photodetector, the correction circuitry configured to make adjustments when the optical emitter degrades;
- and
- a threshold correction signal generator coupled with the first comparator and configured to generate a threshold correction signal in response the first comparison signal.
Dependencies are inferred from the claim text.