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# Photo Coupler

15 Threads found on edaboard.com: Photo Coupler

## LDIMS software for offset coupler

Hello , i am reading an old book about microware couplers, and for calculation of the parameters of the offset coupler they use LDIMS as shown in the photo bellow. does some one know where i can get this function because the book is written at 1988 and google is not very productive. Thanks 136733

## convert table data into geometry (HFSS)

Hello, i am trying to interpret the table in order to recreate the geometry shown in the photo bellow in HFSS,based on the attached article. Zo Ze width properties of each cell ,but i cant interpet those parametr into such thing as , length of each cell, how much higher is every cell to its consecutive? is there some example from which i can le

## Opto Coupler for RF application

no such part. but you could moldulate a laser diode, run a few inches of fiberoptic cable, and hit a photo detector. that would be over 100 dB of isolation if you packaged it properly, but you would have linearity, noise, and signal level issues to fight.

## desining tool for tandem 3dB coupler

Hello, i am trying to build a tandem 3d coupler ,but there are many file element both vissualyy and impedance varying,i shown in the attached photo,is there a to for designing such couplers so i could export them to CST? Thanks 136355

## Input-to-Output Capacitance

In photo coupler Whether I/O Capacitance and Capacitance coupling are same? Can any one clarify me??

## Diode Reverse Voltage Breakdown

Hello All, We are monitoring an AC voltage (200Vac) using a diode and resistor and photo LED of Opto-coupler in series. Here the Reverse break down voltage of diode is 700V, Resistor value is 200K ohm, Opto-coupler reverse break down voltage is 6V. How to analyze impact of negative voltage (i.e. reverse break down voltage)? Where the (...)

## Directional Loop Coupler

The coupler looks like In the catalog photo, one port is terminated with 50 ohms, the other with a N connector.

## SMPS optocoupler feedback improved with common base BJT

The dominant pole of an opto coupler is associated with the photo transistor, not the LED. (I'm not sure which side you mean with the unusual term "opto diode"). Usual TL431 circuits already achieve a current source characteristic a higher frequencies. A cascode stage can partly improve the frequency characteristic of a resistor loaded poto t

## resistance test 817 photocouplers?

I have 3 of these I am wondering if they are bad. On one side reads same regardless of polarity 1k 1k 21k on other side of photo coupler polarity reversed polarity 5.6m ohms 5.6 m ohms 5.6 m ohms 5.6 m ohms 9.7 m ohms open These are in circuit tests. Thoughts? will PC 817 versus EL 817 work the same?

## 6N137 Opto-Coupler internal parts

how the hell should it work if the diode is in reversed bias while to the cathode vcc is supplied Did you notice that most standard optocouplers, either photo-diode or photo-transistor type, are using a reversed biased junction as photo detector? That's far from being specfic to 6N137 "digital" opto (...)

## Differences between opto-couplers, photo-couplers & photodarlington opto-couplers ?

Optocouplers (Optically Coupled) and Fotocouplers (photocouplers) are same thing. Fotodarlington coupler have a Darlington Transistor in its output.Here are the images of a transistor output Optocoupler and a Darlington Transistor output Optocoupler. 61464 61465

## Opto-coupler for smps feedback with base connection?

For analog applications, there are two options to speed up an opto-coupler - use it in current source mode, e.g. a cascode circuit or another means that creates a low (AC) load impedance, to overcome miller capacitance. - use it as a photo diode. In this case, you'll need the base terminal. Did you check, if the opto coupler pole is (...)

## Photo Coupler (Opto coupler)

Hi All I am using Two optocouplers to my inverter mains mode to invereter mode application.I used one opto coupler for zerocrossing detector and another for mains sensing voltage.i connected these optocouplers inputs in it working at all conditions?i am sending schematic as file. if optocouplers inputs connected in (...)

## Looking for docs about methods for heart beat monitoring

check this one may be helpful

## A question about the isolation of a 40db coupler.Help!!!!~

These days I'm trying on a 40db coupler and the isolation is respected to be greater than 25db,while by using HFSS9.0 I got only 20db.How to improve the fact? I used a stripline coupler,a very simple model.you can see from the photo. Hope someone nice can help me ~~please. Another,how to perform the mesh operation?I mean in a model some (...)