How to complete the smart car power loop response test in one stop?

As automobiles become more intelligent, the closely related smart cockpits and autonomous driving functions place higher and higher demands on the chip's computing power. As the computing power of chips continues to increase, its power consumption is also increasing, and the scenarios it faces are becoming more complex and changeable. However, the market needs to reduce the overall power consumption as much as possible to extend the vehicle's cruising range. These changes and requirements bring to engineers A lot of new challenges:

• High-speed computing chips use lower voltage power supplies, but inevitably bring greater current and smaller voltage margins

  
  

• Scenarios are becoming more and more complex, resulting in more drastic load changes and higher current change rates.

  
  

• Automotive safety requirements are higher, and any change in power supply caused by load changes may bring serious consequences.

Chart 1. Under different loops, the same load change brings different voltage drops (refer to ADI)

As shown in the example above, under 3.3V power supply, when the load current jumps from 0.5A to 3A at a current change rate of 0.2A/us, using different power supply loops, the voltage drops are 67mV and 100mV respectively. Therefore, power loop response testing is an indispensable part of the current smart car domain controller hardware design and testing.

In the past, engineers usually needed to use specialized loop response testing equipment to complete power supply loop response testing; at the same time, oscilloscopes were also needed to complete testing of various other power supply parameters. This means that in order to complete the overall power supply test, companies not only have to spend more hardware investment costs, but also need engineers to spend more time learning and understanding related test equipment. So the question is, is there one device that can complete all power test items, thereby helping companies reduce hardware costs and employee learning costs?

In response to the above test pain points, Tektronix has added power loop analysis and testing capabilities that are essential for power supply testing to the existing 12-bit high-resolution oscilloscope MSO5/6B series oscilloscopes.

As shown in the figure, the AFG function generator function is integrated on the MSO5/6B series oscilloscope. The excitation signal is introduced into the loop through the injector. Through 12-bit high-precision acquisition, complete analysis of the entire loop is realized on the software. .

Tektronix MSO5/6B series oscilloscopes

In addition, the power supply test option of Tektronix MSO5/6 series oscilloscopes also includes the functions required for basic power supply testing, including power supply input and output stage analysis, power device analysis, power supply rejection ratio, output impedance test analysis and PDN Analysis of network impedance, etc. In this way, you only need a Tektronix high-precision oscilloscope to meet your domain controller power supply testing needs.

Tektronix MSO5/6B series oscilloscopes provide one-stop power test options and provide almost all power test items including loop response, which can help enterprises respond faster while reducing hardware cost investment and employee learning cost. The challenges of domain controller power supply testing under the current new electronic and electrical architecture help companies put products on the market faster and gain the upper hand.