Help me learn some RF design by modifying my project

Start to learn RF ..

Assalamo Alaykom

This is my first time to enter this RF forum .. and I hope you all are in good health ...

I want you to help me in somethings .. but initially i want to tell you that i am a student in third year communications and electronics department, Ain Shams University at Egypt .. and I have some ( but few ) background about RF circuits ..

I just finished a project to receive IR code sent via RC-5 standard remote controll , decode this code , and then make certain decision using a PIC microcontroller ..

I was asked to modify such project ( not a must but to learn more ) .. the modification required is to add some sort of RF intermediate stage between the IR reomte and IR receiver that is connected to the PIC microcontroller .. this stage is to convert the IR code to an RF signal carrying the same code ..then receive it ( of course in wider range ) at the RF reciver stage then convert it again into IR code again that is to be decoded via the PIC microcontroller ..

Re: Start to learn RF ..

so ur work is to develop both the TX and RX?

very challenging job
good luck

Re: Start to learn RF ..

u will build a PCB and use some off-shelf components ? or u want to go for the analog design of the RF and that's it ?

Re: Start to learn RF ..

omara007 said:

u will build a PCB and use some off-shelf components ? or u want to go for the analog design of the RF and that's it ?

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I can't understand clearly what do you mean.. but i think ( don't know why ) that you can help me ..

I want to say that i didn't design any RF circuit before .. also i don't know how to do such job.. i want to learn this .. can you help me all ?

Re: Start to learn RF ..

al salam 3alykom

read some RF design books , u will find here a lot
search the net about the rf circuits , and implementation
u will find alot of stuff
simulate the circuits
then try to build circuits and measure

and ISA , u will achive what u want

khouly

Re: Start to learn RF ..

Dear Ahmed ..
RF circuits are basically analog .. ( I will not get u into more sophisticated circuits that can be implemented both in analog and in digital ) .. so, in order to build your own analog circuit u need first to have a target .. this target is :
1- Either to reach the satisfactory results on the simulation level .. and that's it .. no implementation for the circuit in the real life .. in other words, u won't have a product in your hand that functions as the circuit you designed.

2- Or you go for drawing the layout of the analog circuit and complete everything to the end .. on IC level .. and then generate the GDSII file (the file to be sent to the fabrication house for manufactoring your circuit). This target mandates that you should have a connection with a certain fabrication house .. you have their own manufactoring library .. and many things .. and moreover, you may sometimes need to pay for manufacturing .. rarely you can find a chance to manufactor you analog design for free ..
This track is considered the hardest .. u will need to prepare urself from the begining .. be good in devices .. be good in transistor level circuits .. and study many other things like transmission lines .. because in the layout you may encounter some similar phenomena due to RF high frequency ..

3- The last thing is not to go for designing the circuit itself .. I mean the analog circuit .. and u just go for available discrete components like RF Transmisster/Recevier chips .. chose a modulation technique that suites u and find the corresponding chip .. working frequency .. things like that .. and then go for building a printed circuit board (PCB) .. this is considered the easiest way to get an RF analog circuit ..

Always remember .. if you can do something the easy way, don't go for the hard way .. UNLESS YOU STUDY ..


Regards
Omara

Re: Start to learn RF ..

Assalamo Alaykom

First of all .. i want to thank you all for your helpfull discussions .. I want to specially thank you Omara .. you really ( jazaka allaho khayra ) seem to help me .. rabbena yekremak ..

the second thing i want to say is for you also Omara.. I want you ( I hope that you dont mind ) to help me to start learning in practice ..

I want to tell you that i studied transmission lines, fields theory, microwave , and some analoge circuits ( mainly on BJTs not FETs ) .. but the problem that in our study ..we don't consentrate on the practical part. i.e. our major responce during study is to solve problems and previous exams .. sometimes we don't understand what is did why it is did in this way .. i hope you understand this ..

I want you to take my hand .. and guide me through your knowledgy in books and tutorials .. tell me please where to start ... which book contains basics for peoples like me that studied manythings but want to organize of defragment his brain !!

I added you to my MSN contact list .. I am Arabic and i think you are also ..if you kindly accept to speak with me on messenger , i will be very happy ..

I don't know how old are you ... but i think i am younger than you as i am still student i am 19 years old ... i hope this don't affect ..but in sha2allah .. i love learning and i am hard worker and will be good student if you accept to be teacher ..

this is can be generalized to all this forum members .. i will consider you my teachers..

thank you very mcuh .. and i am sorry for wasting your time ..
Salamo Alaykom

Start to learn RF ..

Hi ahmed I want to ask do you want to build your cit with discret component or integerated this will affect on cit complexity if you need integerated there will be good IC's in freescale.com try it

Re: Start to learn RF ..

armsgroup said:

Hi ahmed I want to ask do you want to build your cit with discret component or integerated this will affect on cit complexity if you need integerated there will be good IC's in freescale.com try it

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I want to point out something ... this circuit is not my dream in life .. but i consider it as an input to the RF world .. i hope you to read my latter topic again to take a hint about what i want to do ..

Thank you very mcuh ..

Re: Start to learn RF ..

hi Ahmed ..

Analog circuits and RF are like the ocean .. so, the best thing now for u is to be robust in transistor level circuits .. basic circuits no more .. for the time being .. circuits like amplifiers with its variety of types .. u need to know much about all the characteristics of the amplifier for example .. the gain .. biasing .. Operating points .. everything .. keep the amplifier as your starting point .. u can also go for the Mixers .. clipping circuits .. u can easily discover the analog circuits once u got in love with amplifiers ..

About the books .. don't go now for RF books .. just take it step by step .. u have lot of time .. so, don't push and learn gradually in order not to jump to conclusions while missing some important basics .. u can jump later after ur done with basics ..
try normal collage books .. but concentrate on them .. forget the exams .. and try to solve the problems at the end of each chapter .. then go for any good reliable software tool, then try simulating ur first amplifier .. simulate and get all the information thru simulation .. everything .. master a small circuit , then move to another .. and keep in mind that basics are much more important than advanced topics ..

here in the forum , also , you will find many books in analog design .. but my advice is not to annoy urself now with big books .. just use any of the available famouse text books in ur university ..

In the summer vacation , don't waste ur time .. take a tool like (ADS) for example and try to do all ur simulation on .. it will take u much time to understanad the tool itself .. but this is life man .. anyhow .. tools are much funnier than studying the theory .. this is what most of the engineers say !

Finally .. Enjoy ur life .. being an analog or RF engineer is not like being Maxwell or Einstein .. so, take it easy .. many before u managed to be perfect RF designers .. so, it's not magic .. u will be one of them one day inshallah ..

Regards

Re: Start to learn RF ..

Assalamo Alaykom

How are you Omar.. Thank you very much for your advices ... but can you specify somethings to me :

1- What is the name of simulator you mentioned ? Where to get it ? and How to start with it ? ( note that i used OrCAD to simulate BJT ampifiers circuits before but i am not profissional in it )

2- Please specify certain book to start with it ... ( mention its name and i may have it or search for it ) .. I have some analog books such as Sedra Micro-electornic circuits , and another book for analog circuits .. but this i think that we studied well this field in collage .. i.e. i may be able to design a CC,CE,or CB amplifiers with BJT .. not for proffisional level of design .. but not very bad ..

3- I ask you for the third time .. i want to speak to you via MSN messenger or any other available method .. not important to be via voice but i want to be online with you to conversate with you to discuss my state to you ..

Thank you for your help ... Ahmad Abdulghany

Start to learn RF ..

If you want a simpler design, I recommend you visit this site: https://www.radiometrix.com. They provide transmitter, receiver and tranceiver modules. Most of their products are really easy to interface to a system. Once you read some of their data sheets you'll understand. We use these kinds of transceivers in our robots and it work fine. I really like the ease and simplicity of integrating the module to your design.
But if you want something more complex, you can design your own transciever circuit. There's a lot of ebooks in the ebook section of this site...i cant remember what title but i know you can just download them.
Ey, good luck to your endeavor!

Re: Start to learn RF ..

Ahmed

try this healthy discussion :

Re: Start to learn RF ..

omara007 said:

Ahmed

try this healthy discussion :

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thak you Omar .. Really a wonderfull topic .. but the problem is it gave me a lot of books names that i dont know where to get ..

Thanks for help

Re: Start to learn RF ..

ahmad_abdulghany said:

omara007 said:

Ahmed

try this healthy discussion :

h**p://&highlight=

Click to expand...

thak you Omar .. Really a wonderfull topic .. but the problem is it gave me a lot of books names that i dont know where to get ..

Thanks for help

Click to expand...

What particular ones you need? many of them are available via i-net, & lots of them are here, just use "search" option...

Re: Start to learn RF ..

Auster said:

What particular ones you need? many of them are available via i-net, & lots of them are here, just use "search" option...

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I couldn't get anyone of them via internet as you said ... tell me where to get one for free !! thank you