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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.
Have a burnt transistor can only make out these numbers ST 99235 mje 55t the two numbers in front of 55t are missing it could be 2955t or 3055t so how can i tell which type this amplifier would take without any type of blue prints.This is a old unit made in the late 70s .pentetrator 200.Thanks .P.S transistor
Hi I have Design Op-Amp working with 1.2V Supply Voltage. Then i have connected power transistor and feedback resistors, But as soon as i connect output of feed back resistors to the input of Op-amp all biasing voltages get changes and op amp output decreases to around 200mV and power transistors start operating in linear region and Vds=1.2mV ac
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?
Your teacher was teaching about transistor audio amplifiers made 58 years ago. Here is a low power (only 50mW) transistor amplifier made by Philips in 1955 that used a transformer to match the fairly high common-emitter output transistors to the low impedance speaker. Since the transistors were all PNP (...)
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 (...)
I am using Smith v3.10. After calculating required Zs for transistor matching, i realized that Re part is -28, and can't be put into program. How to solve this problem? Samples from my book have no such case. _S11=PolarToRect(0.7,-64.8) _S11 = 0.298045504 - 0.633378937i Gs=1/_S11 Gs = 0.608256131 + 1.292610075i Zs=50*(1+Gs)/(
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