The isolator of claim 7, further comprising a housing, wherein the shield and the substrate are packaged in the housing.ĩ. The isolator of claim 2, further comprising a shield between the light source and the first and second photodetectors.Ĩ. The isolator of claim 5, wherein the differential amplifier circuitry further comprises a differential amplifier coupled to the first and second amplifier voltage nodes and the output, the differential amplifier configured to generate the output electric signal at the output based on a difference between the first and second amplifier voltage signals.ħ. The isolator of claim 1, wherein the differential amplifier circuitry comprises a trans-impedance amplifier (TIA) coupled to the second and third nodes, the TIA configured to generate a first amplifier voltage signal at a first amplifier voltage node based on the first photocurrent, and a second amplifier voltage signal at a second amplifier voltage node based on the second photocurrent.Ħ.
The isolator of claim 1, wherein the first photodetector is a first photodiode and the second photodetector is a second photodiode, the second node is an anode of the first photodiode, the third node is a cathode of the second photodiode, and wherein the first photocurrent flows into the differential amplifier circuitry, and the second photocurrent flows out of the differential amplifier circuitry.ĥ. The isolator of claim 1, wherein the light source is a light emitting diode (LED) or a laser diode.Ĥ.
The isolator of claim 1, further comprising a semiconductor substrate, wherein the first photodetector and the second photodetector are disposed on a surface of the semiconductor substrate facing the light source.ģ. An isolator, comprising: an input terminal and an output terminal electrically isolated from the input terminal a light source coupled to the input terminal and configured to transmit a light signal representing an input electric signal at the input terminal a first photodetector coupled between a first node and a second node, the first photodetector configured to receive the light signal and generate a first photocurrent from the first node toward the second node in response to the light signal a second photodetector coupled between a third node and a fourth node, the second photodetector configured to receive the light signal and generate a second photocurrent from the third node toward the fourth node in response to the light signal a differential amplifier circuitry coupled to the second node, the third node and the output terminal, wherein the differential amplifier circuitry is configured to generate an output electric signal at the output terminal based on a difference between the first photocurrent and the second photocurrent.Ģ.
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