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1. Tuning Base and Collector Currents – All Regions

2. Tuning the Base Current – All Regions

3. Tuning the Collector Current – All Regions

4. The Base Current Profile – Medium Injection

5. The Base Current Profile – Low Injection

6. Conclusions

If you follow this order, there should be a reasonable correlation between measured and simulated data. Most of the tuning parameters, however, have some degree of interdependency to the extent of which is also device design specific. Therefore, some degree of iteration of the tuning parameters is to be expected.

When tuning bipolar transistors, there is a greater emphasis to accessing tuning parameters by using the device simulator, ATLAS, compared to optimizing MOSFETs, where most tuning parameters are process-related. A powerful combination is the tuning of a BiCMOS process where you can use the MOSFET part of the process flow to tune the process parameters, while using the Bipolar part of the flow to tune ATLAS. This technique should yield a high degree of predictability in the results.

Tuning the process simulator parameters in ATHENA are mainly required to model effects, such as the implantation induced defect enhanced diffusion responsible for the Emitter Push Effect, which is essential to obtain the correct depth of the base-collector junction. The correct process modeling of the out diffusion of dopant from the poly-emitter into the mono-crystalline substrate is also critical to obtaining well-matched I-V curves. Another critical process modeling area is the base implant, because it is essential to match measured and modeled base resistance for correct modeling of the collector current. These and other issues are discussed in these sections.

7.9.1: Tuning Base and Collector Currents – All Regions

The most important parameter to model the general level of base and collector currents is the device measurement temperature. The base and collector currents are strongly influenced by temperature changes, as small as a few degrees centigrade. A significant effort should be made to determine the exact temperature of the device during measurements before calibration is attempted. This temperature should be input into ATLAS in the MODELS statement using the TEMPERATURE=<n>parameter. An increase in temperature will cause an increase in base and collector currents.

7.9.2: Tuning the Base Current – All Regions

A critical region for poly-emitter bipolar devices is the interface between the poly-emitter and the mono-crystalline silicon. This region is difficult to process simulate directly as the interface between the polysilicon emitter and single crystalline silicon usually consists of a thin, uneven and possibly non-continuous film of oxide. This is simulated by calibrating the overall effect of this interface with ATLAS. The tuning parameter is the surface recombination velocity at this interface for electrons (VSURFN for PNP devices) or holes (VSURFP for NPN devices). This will only be effective for thin emitters where at least a fraction of the holes (for NPN devices) can reach the emitter before recombination.

Questions & Answers

explain and give four Example hyperbolic function
Lukman Reply
The denominator of a certain fraction is 9 more than the numerator. If 6 is added to both terms of the fraction, the value of the fraction becomes 2/3. Find the original fraction. 2. The sum of the least and greatest of 3 consecutive integers is 60. What are the valu
SABAL Reply
1. x + 6 2 -------------- = _ x + 9 + 6 3 x + 6 3 ----------- x -- (cross multiply) x + 15 2 3(x + 6) = 2(x + 15) 3x + 18 = 2x + 30 (-2x from both) x + 18 = 30 (-18 from both) x = 12 Test: 12 + 6 18 2 -------------- = --- = --- 12 + 9 + 6 27 3
Pawel
2. (x) + (x + 2) = 60 2x + 2 = 60 2x = 58 x = 29 29, 30, & 31
Pawel
ok
Ifeanyi
on number 2 question How did you got 2x +2
Ifeanyi
combine like terms. x + x + 2 is same as 2x + 2
Pawel
Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 1 more than 3 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 113?
mariel Reply
Mark = x,. Don = 3x + 1 x + 3x + 1 = 113 4x = 112, x = 28 Mark = 28, Don = 85, 28 + 85 = 113
Pawel
how do I set up the problem?
Harshika Reply
what is a solution set?
Harshika
find the subring of gaussian integers?
Rofiqul
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Shirley Reply
please can go further on polynomials quadratic
Abdullahi
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Mark
I need quadratic equation link to Alpa Beta
Abdullahi Reply
find the value of 2x=32
Felix Reply
divide by 2 on each side of the equal sign to solve for x
corri
X=16
Michael
Want to review on complex number 1.What are complex number 2.How to solve complex number problems.
Beyan
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Mark
use the y -intercept and slope to sketch the graph of the equation y=6x
Only Reply
how do we prove the quadratic formular
Seidu Reply
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Darius
hello, if you have a question about Algebra 2. I may be able to help. I am an Algebra 2 Teacher
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Opoku
what is math number
Tric Reply
4
Trista
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
can you teacch how to solve that🙏
Mark
Solve for the first variable in one of the equations, then substitute the result into the other equation. Point For: (6111,4111,−411)(6111,4111,-411) Equation Form: x=6111,y=4111,z=−411x=6111,y=4111,z=-411
Brenna
(61/11,41/11,−4/11)
Brenna
x=61/11 y=41/11 z=−4/11 x=61/11 y=41/11 z=-4/11
Brenna
Need help solving this problem (2/7)^-2
Simone Reply
x+2y-z=7
Sidiki
what is the coefficient of -4×
Mehri Reply
-1
Shedrak
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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Source:  OpenStax, Solid state physics and devices-the harbinger of third wave of civilization. OpenStax CNX. Sep 15, 2014 Download for free at http://legacy.cnx.org/content/col11170/1.89
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