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Monolithic linear optocoupler

An optocoupler and monolithic technology, applied in the field of optocouplers, can solve problems such as difficult insulation

Inactive Publication Date: 2003-01-15
SIEMENS MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This isolation is difficult to achieve when two photodiodes are located close to each other

Method used

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  • Monolithic linear optocoupler
  • Monolithic linear optocoupler
  • Monolithic linear optocoupler

Examples

Experimental program
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Embodiment Construction

[0017] image 3 It is a schematic diagram of a conventional optocoupler chip 390 with an externally coupled feedback control loop. The conventional optical coupler includes an LED 300, an output signal photodiode 310, and a feedback control signal photodiode 320. The differential (error) operational amplifier 330 is coupled from the control signal output terminal 394 to the LED input signal terminal 391.

[0018] The LED 300 emits light whose intensity depends on the voltage of the signal output from the differential amplifier 330. The differential amplifier 330 can source or sink the LED current. The output signal photodiode 310 is electrically insulated from the LED 300, but optically coupled to it. The first direction D1 is determined from the LED 300 to the output signal photodiode 310. The anode of the output signal photodiode 310 is connected to the first voltage source V via the terminal 395 S1 Coupled, the cathode of the output signal photodiode 310 is coupled to the outp...

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Abstract

A monolithic optocoupler having a light emitting diode for emitting light, a first photodiode for producing a current based on light sensed by it, a second photodiode for producing a current based on light sensed by it and an insulator for electrically isolating the light emitting diode from the first photodiode. The insulator is substantially transparent to light emitted by the light emitting diode. The first and second photodiodes are positioned with respect to the light emitting diode such or that directional non-uniformities of light emitted by the light emitting diode are compensated.

Description

Technical field [0001] The present invention relates to optical couplers. The present invention particularly relates to a monolithic structure of an optical coupler with improved linearity. [0002] A related application entitled "Method for Manufacturing Monolithic Linear Optical Coupler" by the same inventor who filed the application on the same day of the present invention is incorporated herein for reference. Background technique [0003] The optical coupler is used to electrically isolate the input signal and the corresponding output signal from each other. For example, optocouplers can be used in data access devices ("DAA"). Data Access Equipment (DAA) is used to connect data terminal equipment ("DTE") (such as data modems, fax machines, non-cellular handsets, speaker phones and automatic answering machines) to the public switched telephone network ("PSTN") interface. The network (PSTN) must be protected from possible damage due to data terminal equip...

Claims

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Application Information

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IPC IPC(8): H01L31/12H01L27/15H01L31/173
CPCH01L31/173H01L31/12
Inventor 戴维·惠特尼
Owner SIEMENS MICROELECTRONICS