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Power supply ready for high-speed testing of mobiles

Posted: 29 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power supply? mobile phone? battery charger?

Model 2308

Keithley Instruments Inc. introduces the Model 2308 portable device battery/charger simulator, a dual-channel battery- and charger-simulating power supply designed to provide the lowest cost testing of both the growing range of mobile phones with new, complex transmission schemes and other types of new portable devices that consume extremely low amounts of power, says the company. The Model 2308's fast transient output response maximizes production yields by maintaining a stable voltage level under dynamic loading conditions. In addition, its measurement engine enables more accurate characterization of both full power operation and low current sleep modes for quantifying power consumption so that design and manufacturing can ensure that battery life of the latest portable electronic devices is maximized. The Model 2308 is optimized for ultrafast test times, allowing manufacturers to lower their cost of test.

Fast response times
Unlike conventional power supplies, the Model 2308 features extremely fast recovery even when load currents change by a factor of 10 or greater. This can happen when a portable device or component transitions near-instantaneously from a sleep or standby state to a full power operating state and then returns to the original state. If the load pulse is too short, the conventional power supply may never return to its stable output level during the pulse. Even with long test leads, which add substantial inductance to the load circuit between the power supply and the device under test (DUT), the Model 2308 maintains a stable output voltage in response to pulse loads with a transient voltage drop of under 90mV and a transient recovery time of under 35?s is critical for mobile phones with pulsed-mode operation such as new Edge, WiMAX, and future LTE mobile devices.

Reducing test time
The Model 2308 also saves valuable test time by making fast load current measurements. An optimized command structure minimizes range changes and current measurement times for production testing. The Model 2308 can change range and make a power line cycle measurement in 27ms. With four current ranges spanning 5A to 5mA, and resolutions from 100 ?A to 0.1?A, test engineers can monitor small changes in load current measurements for tight quality control on production runs, says Keithley. Furthermore, load currents, even pulses as narrow as 50? s, are measured with integrating A/D technology.

Fits R&D, too
Keithley claims that the Model 2308 features functionality that makes it suitable both for production test as well as R&D. In production applications, the Model 2308 employs four-wire sourcing and remote sensing for precision voltage sourcing even when the DUT cannot be close to the power supply. The source accuracy enables a Model 2308 channel to act as a calibration source for battery monitoring circuitry used in mobile phones and other portable devices. With two channels packed into one half-rack instrument, one channel can simulate the battery and the other can simulate a charger. In addition, each channel can act as a load as well as a source.

Multiple offerings
The Model 2308 contains two power supply channels, a DVM for voltage measurements on the DUT and digital control ports for relay control. The total package combines a number of instruments needed in production and saves valuable bench space in the R&D lab.

The Model 2308 is particularly for design and test of low-power, battery-operated devices, such as 3G mobile phones, smart phones, MP3 players, Bluetooth headsets, PDAs, and portable GPS receivers. The Model 2308 is also optimized for components and sub-systems, such as baseband/power control chipsets, RF power amplifiers, RF power transistors, transmitters, and transceivers. The Model 2308 Portable Device Battery/Charger Simulator is priced at $2,795, and availability is three weeks.

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