Unanswered Questions
803 questions with no upvoted or accepted answers
7
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2
answers
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Phase shift near saturation mitigation in input stage amplifier -- How does this work, why does this work?
I'm trying to understand how this circuit works on the input stage to the 4192A Impedance Analyzer.
Apologies for the quality... this is the best scan I could find. The design is furnished with the ...
CommunityBot
- 1
5
votes
0
answers
118
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Why does output of this reverse bias noise source not have normal distribution?
I am trying to build a noise source based on reverse biased PN junction (i am trying to replicate this project https://altusmetrum.org/ChaosKey/ ). At this point i tried multiple iterations but so far ...
- 51
5
votes
2
answers
446
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Diode connected transistor for voltage biasing
I am trying hard to demonstrate that the transistor M1 in figure works always in linear region. Transistor M2 is diode connected and consenquently (I am using the EKV model) it works always in ...
CommunityBot
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4
votes
0
answers
147
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Is there any reference to design a 4*4 bit ram only using transistors
I'm currently doing a project and would like some help. I need to create a 4-bit 4-word RAM using PSPICE. (I'm both new to the PSPICE program and new to the topic of RAM)
I currently have successfully ...
- 2,806
4
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0
answers
933
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GaN Vs IGBT performances
I was making some research on GaN and I do not understand why GaN is so reveolutionnary. When I take a look on the following specification RdsOn and Coss (Cds + Cgd), the GaN semiconductor has lower ...
- 2,478
4
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0
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2k
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Piezo Buzzer Driver Circuit
I haven’t used a buzzer before so I have tried to find out as much I could and finally, I am here to clear my few doubts:
Few details about my application:
Buzzer: AST1240MLTRQ (i was not allowed to ...
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3
votes
0
answers
123
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How did the first transistor work?
As an EE I learned all about transistors. Of course these were modern junction transistors for which we have Shockley to thank for developing the physics and the equations.
So I got to thinking about ...
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3
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0
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368
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Minimalist 3-input XOR gate using CMOS
As an enthusiastic noob to CMOS I browsed multiple examples of XOR gates using PMOS and NMOS.
I find it hard to find any good examples of 3-input XOR gates; I found an example of a 4 FET 2-input XOR ...
- 1,956
3
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0
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97
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What is the easiest way to change the polarity of a transistor based simple amplifier?
I would like to amplify signals from a silicon photomultiplier, which is an array of many small avalanche photodiodes (APDs). When one or a few APDs get hit by a photon, a small current will flow ...
- 315
3
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0
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288
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Transistor Ic vs Vce Curve Trace for one 2N3906 Shows Weird Scope Display Not Sure Why
I recently built a transistor curve tracer on a breadboard with my Oscilloscope and Arbitrary Waveform Generator. Most BJT Si transistors (NPN and PNP) show typical/normal traces but one device under ...
3
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0
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77
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Need help in selection of FET for transfer gate
I was studying the variable potentiometer X9C10x series. They are using a series of fixed resistors and some FETs to select points in this series branch. I need one variable point in my circuit. Can ...
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3
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0
answers
175
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Identifying exact type of transistor
I can not identify the exact model of this transistor.
It reacts as a bipolar NPN Si transistor with EBC pin configuration (first image left to right,) not ECB! This seems to be made by Siemens. ...
- 413
3
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0
answers
119
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Gain of single input differential amplifier
When performing the small signal analysis of the circuit shown below, with \$ V_{1} = V_{in} \$ and \$ V_{2} = 0 \$, and output taken from \$ V_{02}\$, I consider the small signal model for half of ...
- 33
3
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0
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119
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Calculating the gain of a specific transistor amplifier circuit
NOTE: There is an error in the drawing above — C1 should be connected to the emitter, not the collector.
Hi Electronics SE, hope this is the right place to ask this, if not I'll gladly take it ...
- 175k
3
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0
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1k
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Comparing sine wave and triangular for spwm using comparator
i am trying to generate sinusoidal PWM by comparing sine and triangular wave.
First i just tried to compare sine wave with reference voltage in order to check the working of op-amp. I get a problem ...
