Breaking News
Comments
Newest First | Oldest First | Threaded View
GSKrasle
User Rank
Author
Test Engineer's cross to bear with AVS
GSKrasle   7/16/2014 4:09:00 PM
NO RATINGS
As a sometime Test Engineer, I have dealt with AVS and similar schemes, and there are particular issues in both Design and Test that have to be dealt with. First of all, the regulator should be designed for efficiency with a view of the use-scenario of the product. If it spends 1% of its time pulling maximum voltage, it probably doesn't make sense to maximize the efficiency then, if it means a loss of efficiency during the other times. So a reasonable use-scenario is important to take best advantage of this technology. For many battery-operated devices, it is probably most important to be efficient during "idle" modes. Or maybe not. The other issue is in Test. When testing power-use, we usually make a tacit assumption that the supply voltage is constant and only the current varies in the VxI=W calculation. That may even be a reasonable incremental approximation in battery devices with slow Vbat changes, but it is not valid for AVS or situations where Rbat is significant; then the problem becomes non-linear, non-time-invariant, and special care has to be used in data acquisition: multiplying Vavg with Iavg does not give Wavg then. Since "averaging" is just low-pass filtering, a data acquisition system can't use low sample-rates and aggressive anti-aliasing filtering; you have to use fa$t sampling, followed by multiplication, THEN filtering+decimation... See http://www.eetimes.com/messages.asp?piddl_msgthreadid=45315&piddl_msgid=302942#msg_302942 for some discussion on this.



Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
Special Video Section
Phase One with Brian McCarson CTO of IoT strategy for Intel
02:30
Phase Two with Brian McCarson CTO of IoT strategy for Intel
03:05
Phase Three with Brian McCarson CTO of IoT strategy for Intel
03:54
Demand for higher performance in mixed-signal circuits ...
10:22
5G LTE is on the way. These systems will require more ...
Protecting sensitive electronic circuitry from voltage ...
09:45
Watch as a web server authenticates or rejects a water ...
Protecting sensitive electronic circuitry from voltage ...
Watch as a web server authenticates or rejects a water ...
Protecting sensitive electronic circuitry from voltage ...
Power can be a gating factor in success or failure of ...
Get to market faster and connect your next product to the ...
00:44
See how microQSFP is setting a new standard for tomorrow’s ...
The LTC3649 step-down regulator combines key features of a ...
Once the base layer of a design has been taped out, making ...
In this short video we show an LED light demo to ...
The LTC2380-24 is a versatile 24-bit SAR ADC that combines ...
In this short video we show an LED light demo to ...
02:46
Wireless Power enables applications where it is difficult ...
07:41