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Dennis Feucht

2-Port Analyzers on a Chip? Part 3: TPA Integration Challenges

Dennis Feucht
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etnapowers
etnapowers
9/5/2014 2:29:04 AM
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Master
Re: separated grounds
@fasmicro: you're right, a good university course should include the economic aspect of an engineering project, to teach to the students that one key factor of the industry is not only the effectiveness of an IC or a electronic device, but also its profitability.

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fasmicro
fasmicro
9/2/2014 5:05:09 PM
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Master
Re: separated grounds
>> a good engineer for example has to carefully evaluate the costs and the gain margin of a device , to be able to propose a profitable product.

But that is one of the things few universities teach in engineering programs. The economics of design is never a huge subject.

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etnapowers
etnapowers
9/2/2014 7:01:00 AM
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Master
Re: separated grounds
Agreed. The background is very important, not only from a technical point of view: a good engineer for example has to carefully evaluate the costs and the gain margin of a device , to be able to propose a profitable product.

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goafrit2
goafrit2
8/9/2014 3:04:14 PM
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Master
Re: separated grounds
>> he difference between a college course and an industry environment is just this:

College prepares one to have the capacity to learn when in the industry. A good background is important to succeed in the industry.

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etnapowers
etnapowers
8/4/2014 6:22:02 AM
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Master
Re: separated grounds
@fasmicro: you're absolutely correct, it comes from experience. The difference between a college course and an industry environment is just this: In the real world the theory is useful to model some effects and to start a design but experience teaches what else has to be taken into account to make the designed circuit working effectively

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fasmicro
fasmicro
8/3/2014 12:42:32 PM
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Master
Re: separated grounds
>> A good design of a test board has to take into consideration the need of the presence of a power ground pin,

It seems that is coming from experience. Newbies experience that point firsthand when the board/chip returns and nothing works. Then they will know that GND is not just as the professor says it is. There is more to GND in the practical design world. Good piece.

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etnapowers
etnapowers
7/7/2014 4:22:23 AM
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Master
Re: separated grounds
@fasmicro, that's right. A good design of a test board has to take into consideration the need of the presence of a power ground pin, to absorb the pulsed currents, and a analog ground pin as well, to have a reference potential that allows to take high precision voltage measurements.

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etnapowers
etnapowers
7/7/2014 3:22:46 AM
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Master
Re: FDS
@Dennis, it's interesting to me to know what are the main differences between FDS and TPA, thank you for your clarification. The test of boards is really important especially in the debug phase, and it's very important to have an application board that incorporates many features to speed up the debugging procedure.

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fasmicro
fasmicro
7/6/2014 1:51:41 PM
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Master
Re: separated grounds
>> The separation of the grounds of the power supplies for the forcing and sensing is really important because the current flowing in the common ground might modify the ground potential and it might affect the measurement operation.

That is usually the hallmark of good designs. Ignore what your ground is doing, burn the chip efficiency. When it comes to measurement system, that becomes more important.

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D Feucht
D Feucht
7/2/2014 11:11:15 PM
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Blogger
Re: FDS
The Floating Differential Source is not exactly a TPA but it is similar. It was designed for manufacturing test of boards having floating analog inputs that need to be tested for CMRR.

It also has a current source for testing floating or high-side current-sense circuits. Although it is somewhat application-specific, the general capabilities of the three sources on it, and the isolated 4-digit DVM make it useful for a wider range of applications as a somewhat general workbench tool.

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