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86 Threads found on Transistor Match
1)why is 50ohm impedance? why not 10, 20, 60, 80? what so special about this number? 2)input to the gate of the transistor which very high input impedance, would that overload the signal source at the gate? 3)why open drain configuration is popular? if you connect a load to it then it's unmatched in terms of impedance. I mean, the load i
Can anyone pls explain me in a simple gist what is matching in layout design. I used a current mirror and i didnt match the L and W the same for 1 transistor and the other 2 were the same of the total 3 current mirror structure. The reason i did was when i matched them equally the current got copied more that what i was (...)
Hello , i have one broken transistor but i dont know with which one to change it , on the transistor it's written: 014(on the first raw) , MO5AF(on the second raw) , and 31045 (on the third raw) I couldn't find anything about this transistor. Sorry for my bad english.
In most amplifiers there will be two output transistors and if it's stereo they will be replicated in the other channel. Can you match the numbers you can see with the other ones? If that isn't possible, with the failed transistor removed, power it up and measure the voltage between the collector and emitter connections, if the collector is (...)
What is the ICMR or you Op-amp? What is the Output Voltage that you are targeting? Do the two match? You should have designed the entire LDO together and not in parts (Error Amplifier and then Power transistor)
I have biased my circuit and i have check the stability. Now my next step is i want to match the 50 Ohm impedance to load impedance here in my case load is transistor. So i have used the following methodology for my impedance i.e., first i have loaded the s parameters of a transistor then i have given the gain of a (...)
What is your signal frequency? For your task I would use a simple transistor stage with a 4:1 output transformer to get a good match to 50 Ohms. If your "PA stage" is working well with 2 V peak output (across what impedance?), it should be again easy to use a 4:1 transformer to get 0.25V across 50 Ohms.
Friends I am new in RF design. I want to design a class A power amplifier at 850 MHz by ADS. How to calculate Zin and Zout of transistor Q2SC5761_M16 for input and output matching network. Hfe of transistor Q2SC5761_M16 and QN3440 are 300 & 100 respectively. Graph of Vce Vs ic is correct but graphs of Zin and Zout are wrong. 10
Hi everyone !! First Happy New year ! I am trying to design an operational amplifier and the model of the transistors I am using is in this link: In this file, I donīt know what value of Vth should I choose for my calculations for a NMOS transistor and
Mitsubishi stopped production of 2SC1971 many years ago. So most of the parts sold today are counterfeits. But power transistors made by Advanced Semiconductor Inc. are worldwide recognized that match very well the originals:
I am a little comfused about choosing best suitable transistor for certain S21 magnitude. What is the fast way of doing that? For now, i use s-parameters, then do simple match of gate to 50Ohms and see if s21 magnitude is enough. But maybe there is some other faster way, or rule. So i can just see at bare S-parameters in datasheet?
our teacher taught us about transformer coupled power amplifier with the transistor in ce configuration, while noting down the advantages of this kind of amplifier she mentioned that the use of transformer helps in 1)impedance matching 2) to couple two stages i.e amplifier and the loud speaker. disadvantages was: THAT CE CONFIGURATION CAN'T
aruipksni, A signal that's '0' is essentially connected to ground (switched to ground by the logic device's transistors)...
Why need match Not all circuits do. Digital doesn't care, single ended amplifiers don't care. But matching is one of the few attributes of integrated technology that are superior to the best-available discrete transistor in the best (not the one-and-only-at-hand) technology, so these matching-centric techniques are used (...)
Sure it can have a negative real part, if it's an active network. But you can't match to it with a lossless network. You can either move Z into the RHP using series/shunt resistance, or change the transistor circuit to give a RHP Z.
Hello everyone I faced a weird problem and I want to know if you ever had such problem? (I am using ADS 2009) I learned a technique to match transistor. (I used BJT RF transistor BFR91A) 1-set the operating problem 2-Get the S parameter of the transistor 4- then put S parameter in a "s2p_eqn" erase S12 then (...)
Hi all, I have to perform an experiment on my own. Experiment title is 'find H parameters of BJT transistor'. I don't have a clue what to do. I am asked to show hie, hfe, hoe calculated values in lab that should match to specification sheet of transistor. please tell me how to proceed step by step. Thanks in advance.
The components on the Lh. side are to give a good input match (50 ohms?) to the input impedance of the transistor ( 2K ohms?) (C16,20,23,21,25 and the L3). C21 and C25 also isolate the DC at the base of the transistor from being shorted out. R23 and R26 provide a DC bias to the transistor Q5, so it is taken the correct (...)
Not an exact match, but the common TIP147 should be usable. Better suggestions can be made if you described the role of the transistor in the circuit - what it is doing, the voltage and current it must withstand, etc. Hope this helps. Tahmid.
... Some say series is good as it will match the models well I think you picked the right point. But if you don't need high accuracy results from the analysis, a single long transistor will work quite well -- if it's allowed by your PDK simulation models. There should be no difference in noise injection for