All Questions
Tagged with differential transistors
27
questions
0
votes
1
answer
214
views
BJT differential pair on breadboard enters saturation
I've built the following circuit on a breadboard (for the purpose of experimentation) and measured the voltages:
IN+ and IN- ...
- 1
3
votes
2
answers
114
views
Operation explanation of a low-swing differential receiver (amplifier)
The following figure shows an example of a low-swing differential receiver given in Hall's Advanced Signal Integrity for High Speed Digital Designs
However, I cannot figure out how this circuit works ...
- 183
1
vote
1
answer
157
views
Differential equation of the NPN transistor configured as a voltage divider
The mathematical model in AC of the NPN transistor is represented by the pi model which is only one resistance in parallel to the resistors of the divider and the DC source in parallel to the ...
- 111
2
votes
0
answers
89
views
How do you find rO when solving this differential amplifier?
gm could be determined using Jacoletto (40*Ic, where Ic was found while solving the bias point)?
Some of my attempts at solving the circuit
- 21
0
votes
1
answer
381
views
Confusion on operation of bipolar differential amp (long tailed pair)
Let's say there's a basic differential amp constructed with two npn BJTs.
And a current source is working as the tail.
The task I have is to amplify a small AC signal of around 1mV p-p, referenced to ...
- 1
0
votes
3
answers
265
views
Differential amplifier (transistors): Which input is inverting?
For example, on the following differential amplifier it is clear, which of the inputs is the inverting one. If the voltage on the non-inverting input (base of Q1) is higher, the current through Q1 ...
- 33
0
votes
0
answers
272
views
Differential Amplifier, what is the purpose of extra emitter resistors?
I am curious about this differential amplifier circuit:
What is the purpose of the two R'E resistors? I know that the big RE acts as to help set up the current source for the DC Q-points, but I have ...
- 705
1
vote
2
answers
7k
views
How do we explain the common-mode feedback in an intuitive way?
There are such beautiful circuit ideas that make you hold your breath and admire them silently. Such an idea is the common-mode feedback (CMFB) in fully differential amplifiers. I was not familiar ...
- 17.5k
3
votes
0
answers
119
views
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
0
votes
2
answers
554
views
differential amplifier gain
i know that the differential gain of the differential amplifier ( mosfet or bjt ) is _gmRc or _gm Rd
looking at the curve : if the current went down in one side and up in one side the gm will change ...
- 329
1
vote
1
answer
652
views
input resistance of differential amplifier
i have a question about the differential amplifier
i know that the input resistance for the common mode is
Rin = rpi + 2 Beta Ree / 2
but my question is what is the input resistance for the ...
- 329
0
votes
1
answer
176
views
Gilbert Cell Output Current
I do not understand the basic of a Gilbert cell.
I see that as its output we consider the output differential current Io. But I do not understand it. Is the load connected between the points 1 an 2? ...
- 3,550
2
votes
1
answer
373
views
HFA3096 transistor array breakdown voltage
In the book Learning the Art of Electronics, one of the labs is to build a differential amplifier with a CA3096 transistor array. The author admits that the chip may be difficult to find and gives the ...
- 1,167
0
votes
0
answers
119
views
Differential Amplifier Exam Problem
I am lost with how to approach part C and D of the question. In fact, I need some intuition with how to tune a differential amplifier.
- 85
0
votes
2
answers
220
views
Finding Drain voltage of current mirror
Below I have a current mirror loaded differential amplifier. Can somebody please Just give me an idea of how to find the drain voltage, vd8. I am stuck because I don't see the relationships that can ...
- 299