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Howard Skolnik

Bipolar Transistor Circuit Design & Analysis, Part 6

Howard Skolnik
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etnapowers
etnapowers
5/2/2014 3:26:50 AM
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Re: When small signal analysis is appropriate
A temporary failure is a failure affecting the functionality of the IC for a certain timeframe. It can generate the failure of the overall circuitry so it has to be accurately avoided because it is as dangerous as a destructive failure.

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etnapowers
etnapowers
5/2/2014 3:26:18 AM
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Re: When small signal analysis is appropriate
@chirshadblog: agreed, that's absolutely very important not only to identify the failure but moreover to prevent it and to have a good estimation of the possible type of failure, whatever will be destructive or temporary.

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etnapowers
etnapowers
5/2/2014 3:24:11 AM
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Re: When small signal analysis is appropriate
@chirshadblog: yes, you're correct, it can be only reduced by a proper design of the application circuit board and a good choice of the process, but unfortunately it cannot be eliminated.

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etnapowers
etnapowers
5/2/2014 3:23:23 AM
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Re: When small signal analysis is appropriate
Netcrawl, that's absolutely correct, it's important to choose the appropriate device for the specific application , taking into account the electrical specifications requirements and the sensitivity to radiations of the ICs utilized.

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etnapowers
etnapowers
5/2/2014 3:22:39 AM
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Re: When small signal analysis is appropriate
@fasmicro, I agree with you on the need of a robust process to ensure a good reliability, but it's important to remember that also the architecture of the system plays a role in the overall reliability, so the designer is a key figure of the production process flow as well as the product engineer in charge of the development of the technology.

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chirshadblog
chirshadblog
3/27/2014 11:09:58 PM
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Re: When small signal analysis is appropriate
@etnapowers: Well the radiation does have some serious impacts, so its vital to identify the damage and try to minimize it from the beginning itself. If not it won't be easy as such to move forward.  

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chirshadblog
chirshadblog
3/27/2014 11:01:02 PM
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Re: When small signal analysis is appropriate
@etnapowers: Yes it can be reduced not eliminated isn't it ?              

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chirshadblog
chirshadblog
3/27/2014 11:00:11 PM
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Re: When small signal analysis is appropriate
@Netcrawl: True but if the design patterns are matched at least 85-90%, the risks of degrading will be very low isn't it ?             

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Netcrawl
Netcrawl
3/27/2014 8:54:50 PM
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Re: When small signal analysis is appropriate
@etnapowers I agree with you proper design is key, BJTs are quite sensitive to ionizing radiation, such radiation causes junction leakage and gain degradation. 

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fasmicro
fasmicro
3/27/2014 6:48:06 PM
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Re: When small signal analysis is appropriate
I think you achieve such by using a different process and not just the transistor. Even if you use a BJT, for radiation-hardened design, you may need a new type of process. The problem is not just electrical, it is mechanical. A unique process helps.

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More Blogs from Howard Skolnik
Demonstrated in this series has been an easy way of visualizing the terminal impedances of a bipolar transistor. With this understanding, one can design simple, yet reliable, voltage or current gain stages to satisfy a variety of interface needs. Also suggested were “advanced” techniques to optimize performance for a particular application
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In Part 3 of this 6-part blog leading up to our "Ask the Experts" session on March 26, we continue to refine the design topology towards practical, reproducible, solutions.
In Part 2 of 6 in this blog series leading up to the March 26 "Ask the Experts" session, we define the ac gain equation and expose factors affecting accurate results.
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