Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Re: WLL ????
Also in some WIP systems, which uses TDMA techniques, if you have two sites all operating in the same band, you space your sectors so that two sectors of the same frequency do not interfere with each other.
Re: why do we use complex exponential mathematics in dig com
Also, sometimes we need phase information, that can only be derived using exponential means. I.e Real and Imaginary, and when you convert that to polar notation you get the phase and magnitude, for example when you do power spectrum...
LMDS Info
Hi
I want info on LMDS, specifically technical details, modulation schemes etc.
Can anyone refer me to a paper or site with such detailed info on LMDS operation?
Thanks
ofdm orthogonality
Ortogonality can not be entirely preserved but is improved by using guard intervals and forward error correction techniques.
Also, each carrier operates at low bit rates. The equipment used in OFDM systems are also very linear to eliminate any other phase alterations.
ADSL and fiber
Hi
I want to find out why does fiber optic transmission systems pose a problem to ADSL technology? Here is a quote from a site discussing ADSL and VDSL.
Several other factors might disqualify you from receiving ADSL:
Bridge taps - These are extensions, between you and the...
Hi
What is the signal bandwidth of a CDMA signal after spreading, also for WCDMA. There has to be a standard. I know CDMA uses a 1.25MHz channel and then spreads it, but to what? and WCDMA uses a 5 MHz channel and then spreads it.
Any help?
Energiser design????
Hi there
I want to design and build my own energiser for a home electric fence system. Does anyone have any knowledge of this type of circuit and where can i get information regarding this topic.
Any help would be really appreciated.
Willem
Namibia
Hi there
I want to design and build a DCtoDC converter to boost 12V to about 20V. I am a bit rusty with my basic electronics, could anyone help or suggest a circuit. Also, it would be great if the output is slightly variable.
Is there a IC that i can use or a circuit floating around...
+pcb +oscillator
I agree with soben about the link between the emitters, one thing that i have found is that it is not necesary to use the other emitter pad at all. you just use the one in your schematic. the other one you can cut off as close as possible to the device. So you dont even need to...
Re: Designing an oscillator
The BFP420 is an excellent choice. It has more than enough gain at the frequency you intend to design at. I used it in a 4 GHz oscillator and it works fine. The older versions of ADS does not have the S-parameter model of the device but you can get it from infineon...
Hi
You dont specify what type of fiber you are going to use. You say you want to transmit over 4 km, that means you cant get away with multimode fiber anymore (MM is used below 2.5 km). Your solution is to use singlemode fiber it uses a signal wavelength of 1550 nm. I havent designed circuits...
My specs are as follows:
Frequency: 1787 MHz to 1797 MHz
Input power: +/- 25 dBm
Output power: +/- 30 dBm
Supply voltage = 9 - 15 Vdc
Any thoughts on which device will be suitable will be appreciated. This is my first time desiging a power amp so i dont know which devices are really used.
I...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
