Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent 5991-0519EN Download the application brochure c20141003 [12]

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Keysight Technologies
Enhance the Battery Life of
Your Mobile or Wireless Device




                      Get the tools you need
                      to measure and analyze
                      dynamic current drain from
                      sub-microamps to amps
    Powering the wireless revolution

    The success of the wireless revolution is visible in the number of devices we use
    every day: smartphones, tablets, e-readers, GPS units, wearable patient monitors,
    heart-rate monitors, and many more. Some attribute this success to the long-
    awaited convergence of highly integrated technology, wide bandwidths, application
    rich content, and attractive pricing.

    Of course, the insatiable demand for anytime, anywhere access leads to end-user
    expectations that increase the pressure on product designers. As an example, visit
    any product-review page and one of the biggest issues--or opportunities--becomes
    clear: battery life.

    The power challenge stems from two shared issues. One is the need to use power
    from a battery or low-power DC bus. The other is long periods of standby operation
    between bursts of intense RF activity. The resulting current drain is pulsed with
    extremely high peak current, low duty cycle and low average values. Accurately
    measuring the proile of dynamic current drain can be dificult and challenging with
    many of today's existing tools.


                                                         Scaling the measurement challenge
                                                         To maximize battery life, you may use a variety of advanced power-management tech-
                                                         niques. For example, subcircuits can be rapidly turned on and off to help reduce overall
                                                         power consumption. As the device transitions between different operating states, this
                                                         creates dynamic current consumption that ranges from sub-microamperes to amperes.

                                                         Measuring these dynamic changes is essential to understanding power consump-
                                                         tion and battery life. However, handling a 1,000,000-to-1 ratio between minimum and
                                                         maximum current levels is not possible with typical tools: digital multimeters (DMMs),
                                                         oscilloscopes, current probes, conventional source/measure units (SMUs), or multiple
                                                         shunt resistors. Using these tools can result in poor results, inaccurate understanding
                                                         and daily frustration.



               Figure 1
               Wireless temperature sensor current
               drain. After the Initialization current    10 mA/Div
               pulse the sensor reads/transmit
               every 4 seconds.                                           Initialization     Read/Transmit current pulses (23 mA)
                                                                          current




                                                                                             Standby
                                                                                             current (24 

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