All Questions
Tagged with semiconductors analog
15
questions
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Why does light doping imply a large temperature coefficient?
In a discussion about how one can make integrated resistors in a given IC technology, Gray, Hurst, Lewis, and Meyer (Analysis and Design of Analog Integrated Circuits) remark that if we want to use a ...
- 1,161
3
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1
answer
219
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Why do PMOS suffer a worse body effect than NMOS?
Gray, Hurst, Lewis, and Meyer give the following discussion around PMOS transistors which I followed except for the sentence which reads:
Good use can be made of this fact in analog circuits to ...
- 1,161
2
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1
answer
301
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How are Analog Chips produced?
I am curious about how analog chips are produced. I know that the most advanced logic are made with many rounds of deposition, etching, lithography, etc, but I haven't seen much material about how ...
- 31
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0
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86
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Why do we dope low amount of impurity atoms in a semiconductor?
I read that the doping ratio is usually around 1 impurity/10 million atoms. Why is that ratio so low? Can’t the semiconductor conduct electricity better if there were more charge carriers?
0
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1
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51
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Do conduction electrons recombine with positive donor atoms?
Once the 5th valence electron of a donor atom left, it will be to the conduction band, so the donor atom becomes positively charged.
My question is if it is possible, that a free electron from the ...
2
votes
1
answer
73
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Hole current in p-type semiconductors
I know about p-type semiconductors and that there are holes as majority carriers present in the semiconduction. If we apply current through this semiconductor electrons from the valence band will come,...
1
vote
2
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86
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Do holes in a semiconductor just move when there is a current going through the semiconductor?
If a current travels through a semiconductor holes travel to the "end" of a semiconductor, where they can recombine with incoming electrons. Does this also occur if there is no current ...
0
votes
1
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135
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Why is intrinsic carrier density only equal to hole - or electron concentration?
If carriers can be holes or free electrons, why isn´t the intrinsic carrier concentration equal to the sum of the free electron concentration and the hole concentration in the semiconductor?
1
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1
answer
76
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Is generation and recombination same in extrinsic semiconductors?
For example, if we have an n - type semiconductor, so there are more electrons in the conduction band. So wouldn´t the recombination rate increase, opposed to the generation rate, because there are ...
6
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3
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872
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Why is the Base-emitter ON voltage as high as 2V in the BJT datasheet?
Below is a snippet from a BJT datasheet. Why is the Base-emitter ON volatge mentioned as 2V?
The Base emitter voltage should be 0.7V when the BJT conducts.
- 3,032
1
vote
1
answer
218
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Formula for efficiency of half wave rectifier
I came across this formula for rectification efficiency of half wave rectifier:
η= (40.6 *resistance of load resistor )/ (resistance of load resistor+ resistance of secondary of transformer + ...
0
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1
answer
148
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Is this question wrong? possible to calculate gain without beta or Ic given? [closed]
How to proceed with this question? I can't think from where to start.
- 17
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3
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165
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Dependency of Collector current in common base transistor(active region)
I just started reading about transistors from book "Microelectronics circuits"by Sedra/Smith,
This is written in book which I don't understand, any help would be much appreciated
For forward ...
- 1,184
0
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1
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2k
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What is the difference between cutoff and subthreshold region of an N type MOSFET?
I understand that some current does flow from drain to source when Vgs is below vth and Vds is greater than zero. Why does this have a different name and a different region in Cadence Virtuoso tool ...
- 209
0
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1
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340
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MOS Capacitor Band Edges
I am trying to understand the MOS-Capacitor band edge shapes. When negative voltage is applied for gate, why does the band edge across the insulator shift upward (and linear decreasing band edge)? ...
