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WKetel
WKetel
6/20/2013 7:34:19 AM
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Re: FG on a chipof
A function generator is used for many different kinds of testing and circuit development. Puting most of the circuit on a single chip allows the creation of a rugged and inexpensive piece of test equipment, as opposed to the earlier versions that  used quite a few discrete components to produce the various waveforms. 

Evidently you don't do much real-world analog dvelopment work, although function generators can be very useful in the development of non-microcontroller digital development. NOT all of electronics is involved with software and controllers, after all.

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WKetel
WKetel
6/20/2013 7:27:25 AM
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Re: Home made analog intruments
Vishal, I would seriously question the linearity and accuracy of a $3 DMM, since those are the things that add to the cost of production, as well as being more difficult to design. And it may be that they are the production-line "fallouts" from a maker of DMMs that normally sell for a bit more. Counterfeiting products does happen in more than one way. It would not be the first time that rejected items have been represented and old as the good product.

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Brad Albing
Brad Albing
5/28/2013 12:22:47 PM
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Re: FG on a chipof
>>... dynamic compnesation and adjustment of amplifier response, for instance, and would replace trim capacitors. I can see applications for that for ICs that are doing dynamic cable compensation (coax or twisted pair), used for either video or high-speed data.

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D Feucht
D Feucht
5/26/2013 12:47:26 AM
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Re: FG on a chipof
The reasons for integrating a function generator on a chip are the usual ones: to reduce parts count, cost, and size. FGs are versatile waveform sources and to be able to simplify their construction can reduce instrument prices, size, and power usage. Although waveform generators (WGs) - digitally generated waveform sources - are ascending, they cannot provide the frequency performance of a well-designed analog FG.


As for the use of FG circuits as subsystems in larger ICs, this has not been explored much, to my knowledge. Any on-chip analog testing might better be perfomed by built-in WGs. To test circuits on-chip dynamically, however, is a topic at the frontiers of integration. Dynamic on-chip measurement would be useful for dynamic compnesation and adjustment of amplifier response, for instance, and would replace trim capacitors.

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amrutah
amrutah
5/25/2013 11:08:05 PM
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FG on a chipof
Dennis, Thanks for a interesting post.

  I have used and worked on IC's that have internal ADC's for measurement of chip parameters like internal voltages, current, power and so on to send the information to other devices or processor.  To an extent it can be used for testing (A DFT kind of device).

  I really dont understand the use of FG as an intrument on a chip?  Is it used for checking the behaviour of the analog by applying different signals?

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analoging
analoging
5/23/2013 4:06:49 PM
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those were the days
Ahhh, those were the days...running manual multi-meter measurements and recording the data manually. As more applications are developed for mobile devices, I look forward to EMF sensing capability for smartphones that can automate electrical device testing and upload the data to a server. Well, heck if they have GPS and one can pay with a phone by scanning their credit card, the tech is probably at the lab level somewhere.

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Brad Albing
Brad Albing
5/23/2013 10:13:25 AM
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Re: integrated DMM
I recall that blog. That was a nifty piece of test equipment, and a good example of integrating lots of analog functionality into a small amount of real estate.

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Brad Albing
Brad Albing
5/23/2013 10:11:11 AM
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Re: 2206
I did the same, but with the (now nonexistant) ICL8038.

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Brad Albing
Brad Albing
5/23/2013 10:10:15 AM
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Re: Home made analog intruments
DF - you could go back to the arrays with a bunch of pinouts, but I'd be concerned that, even for preliminary testing of a concept, the parasitics as you've mentioned might be troublesome.

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Vishal Prajapati
Vishal Prajapati
5/23/2013 6:03:51 AM
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Master
Re: Home made analog intruments
Sir DMMs are being sold here in India even at less than $3 pretty similar to what you have shown in the image. I have never been able to understand their economics. Don't know how they manage the retail price of $3 for whole product?

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