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Secondly, a correct DUT power supply method is required, using batteries or power sources. The purpose of the power supply is to detect DUT independently of the battery to ensure consistency in detection, or to quickly replicate various battery states without waiting for the battery to reach these states (overflow, partial discharge, complete discharge/end of life).

Other critical system components include: current converter for measuring current, digitizer for recording voltage and current signals, and software for decomposing and storing detection data. These detection data will be very large for long-term detection, up to several Gigabyte.

Measurement considerations

The power supply used in battery consumption decomposition must be independent of the battery to describe DUT. The power supply must have a fast response to minimize the transient voltage drop caused by the fast rotating current pulse of the DUT during mode switching or pulse transmission.

Many general-purpose power supplies may experience transient drops of up to 1V under these conditions, so specialized power supplies (sometimes referred to as battery simulation power supplies) that can tolerate these conditions without voltage drop should be used.

The rapidly changing current waveform flowing from batteries to mobile devices poses two measurement challenges: range and speed. Firstly, the dynamic range of current may exceed 1000:1, or even 1000000:1. The full power active current is in the range of 1-3A, while the low sleep mode level current is in the range of tens of microamps, so the range of the current to be measured poses a challenge for the selection of current converters.

Current sensing resistors or diverters can be used here, but choosing the appropriate size of diverter can be quite challenging. If the size of the splitter is suitable for measuring the minimum current, there will be a significant voltage drop at both ends of the splitter during high current events, which will impose an unbearable voltage burden on the circuit. If the size of the splitter is suitable for measuring large currents, it is highly likely that there is not enough voltage available for measurement when microampere current flows through. By equipping several splitters for measuring different current levels, engineers can handle signal level issues, but switching the splitter at this point means interrupting the measurement.

In terms of measurement speed, digitizers used to measure current divider voltage and mobile device bias voltage should have a sampling rate of 50kHz or faster to capture sub millisecond level pulses, which is a characteristic of complex power management methods.

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