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.
Klaus, thank you very much for the response.
But, still I am a little confused. The first thing is that you calculate just for C, where as we are using R and C, not only C to make 50Ohms impedance range as it is shown in datasheet. Does that work?
The second thing is, as I was trying to...
Hello every one,
I am trying to use ad831 RF mixer. As it is stated in the datasheet, R||C input impedance matching is suggested by showing R and C values graphical for different frequencies. My problem here is, a unit for C values is not shown there. is it in pF, uF,nF? I have attached a...
FvM,
Very sorry, I am back again. I have two questions here:
1. "Use capacitor to clock oscillator DC bias" mean using capacitor instead of supplied Vcc? if yes, how I may make its circuit?
2. "you may want to increase the resistor value", I need to increase the resistors value you mean?
I...
FvM,
Thank you a lot for your help.
I am sorry, i couldn't get your explanation fully(take in to consideration that I am just a beginner to circuit design). As to my understanding, there is no any DC supply to these RF and LO inputs. how could that happen? would you brief it more?
Thank you...
Hello every one,
I have solved the problem mentioned above by using standard voltage regulator.
I stack again due to some other problems. A local oscillator oscillates 59MHz where as input RF is 60MHz. An output IF is supposed to be 1MHz, I guess. But, it is 60MHz instead. What could be the...
Dear Klaus,
The -5V voltage regulator I am using is NJM7905A which can supply up to 1A. I expect my circuit to draw around 0.65A approximately. But, what it actually draws is 1.2A. The PCB is getting very hot for which I disn't use coolant spray. I will try to use standard VR as you...
Dear Klaus,
Thank you very much for your help.
I have been using my digital multimeter(DVM) for some other circuit and working properly. The -5V supply source is also working perfectly while applying for other circuits. As you mentioned, there is high current measured. That could be a...
Hello every one,
I am software guy. Some how trying to use ad831 as a mixer connecting in parallel as seen on attached file. +5V and -5V are supplied to both of the mixers from the same source. The problem I faced is here. While measuring the supplied -5V at each mixer it shows ~ -1.2V. what...
LMA,
Thank you a lot for your help.
Yes, it can be rearranged in a way you did. But still Zm is expressed in terms of the other, not Zm and ZL are expressed in terms of Z1 and Z2.
I want to collect Zm and ZL to one side to express in terms of Z1 and Z2.
andre_teprom,
Thank you a lot.
As you said, it may not be re-arrangeable . Still, in case there is some one who could do it, I am looking forward.
Thank you
Hi Akanimo,
Sorry, I guess you didn't get my question. I want to express Zm and ZL in terms of Z1 and Z2. Let it be (Zm*ZL)/ (Zm + ZL) = (Z1 -Z2)/ (Z1*Z2). I need in such away.
Thank you a lot.
Hello Every one,
It was tying to equate complex number summation. It looks easy, but took me a while to solve it . would you help me please? It is attached as image as follows:
Thak you in advance.
Thank you very much for your really helpful answers.
And very sorry for not to divide my bunch of words in to paragraphs( I will try to use the new lines which are for free :grin::grin::grin: )
Again ,Sorry for make it very general.
Here below, a simple schematic for the encoder...
Hello every one. I am new to motor encoder. While trying to read motor encoder position counter and direction via Quadrature Encoder Pulse (QEP) , the position counter reading is good, where as direction reading keeps changing from 0 to 1, though the motor is moving to the same direction. why do...
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.
