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There were a couple of designs done on InP at the University of Illinois (Urbana-Champaign).
Is there any student on campus who can help me review one of the designs from 2004.
It is high speed related, like 20 or 40GHz.
Sorry for the late reply, if you pick up a transistor with a very high ft (say 50GHz for a 3GHz project) then it is very easy to generate an oscillator due to simple and unavoidable parasitics (add the board, the solder, the pads, the small transmission line interconnect). The transistor has...
I am looking for and old document written by Caprio about linear transconductors. The title goes like: precision differential voltage current converter or convertor.
I need some help trying to locate a copy, if somebody can help me I can provide a bit more information about the document.
Please...
Currently, I am at National!!!
Yes I do have a full set of old databooks.... I kept them because of the schematics.....
The situation is I have a GaAs NPN only process.... no PNP anywhere or allowed.
So creating a sourcing current source is a problem...... trying to avoid resistors.
level...
Duuuhh my mistake, did not check what parameter you were plotting..... I think you can easily get the S parameters (in 50 ohm mode) in HFSS and then you can calculate Zo from the reflection coefficient equation.
Now, people are telling you that Zo does not change versus frequency....it does...
Any good old book for bipolar circuit design with only NPNs ???
Does anybody has a good reference for circuit design with only NPN transistors??
I know many years ago only NPN were available, so there must be one of those old books that has been forgotten or lost in time....
If you take a look at some the theory and equations for basic transmission lines you will notice that at a quarter, one eighth and half a wavelenght points, interesting transformations happen.
For example, a short can become an open (and viceversa)
You can transform some reactive elements to...
It seems you are not familiar with VCOs...
1.-Most VCOs the frequency is a function of an analog voltage. So, no there are no TTL levels...although you could use them...but that gives you very poor frequency selectivity unless you have lots of bits.
2.-Comb generators produce an spectrum that...
1.-Read Gonzalez book "Microwave tansistor amplifiers"
2.-Read again and make sure you understand it.
3.-If you want a 1-3 (or 4) GHz amplifier probably you need a transistor with and ft of about 9 to 16GHz. More is not always better. Bipolar would be easier and cheaper to find.....
4.-Most...
A Dc blocking capacitor simply blocks any DC signal..... as the previous poster mentioned, connecting two stages with dissimilar DC bias points will screw up the biasing of both stages. So putting a simple capacitor solves the problem, at RF you need a relative good capacitor to ensure it does...
You need a scope whose BW is greater that the frequency of the signal you are measuring (assuming a simple sine wave).
So if you want to see 800-900 MHz signal in time domain you will need a scope with 1GHz of more BW.
The detector approach will not give you much information except that the...
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