Simulation method of power distribution system and acquisition method of target impedance
A power distribution, target impedance technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of small target impedance, increase the cost of power distribution system, over-design of power distribution system, etc., and achieve accurate target impedance , reduce cost, prevent over-design effect
Active Publication Date: 2016-10-12
JIANGNAN INST OF COMPUTING TECH
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[0007] The inventor found through research that the target impedance of the power distribution system obtained through the simulation of the prior art is small, which leads to the need to design too many decoupling capacitors, thus resulting in the overdesign of the entire power distribution system and increasing the power distribution system. cost
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[0040] Modern integrated circuit technology has entered the deep sub-micron stage, and the rise / fall time of digital signals is generally on the order of sub-nanoseconds, which poses great challenges to the design of high-speed digital systems. In a high-speed PCB, due to the impedance of the power distribution system, when the ΔI noise current and the transient load current pass through, the ΔI noise voltage will be generated, which in turn will cause fluctuations in the power supply voltage. In order to provide a stable power supply for the load chip in the power distribution system, the key is to control the target impedance of the power distribution system. Generally speaking, the chip has certain requirements for the fluctuation range of the power supply voltage. In order to meet the requirements of the chip for the fluctuation range of the power supply voltage, The following formula is usually used to obtain the target impedance of the power distribution system:
[0041]...
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Provided are an obtaining method of target impedance of a power-supply distribution system, a simulation method of the power-supply distribution system and a co-simulation method of the power-supply distribution system. The obtaining method of the target impedance of the power-supply distribution system comprises obtaining time domain overturn current of the power-supply distribution system on a load chip based on electrical properties of the load chip; converting the time domain overturn current into frequency domain overturn current; obtaining the target impedance of the power-supply distribution system corresponding to the frequency domain overturn current. By means of the technical scheme, the accurate target impedance of the power-supply distribution system is obtained, excessive design of a decoupling capacitor of the power-supply distribution system is avoided, and cost of the power-supply distribution system is reduced.
Description
technical field [0001] The invention relates to the field of power distribution system design, in particular to a method for acquiring a target impedance of a power distribution system, a simulation method for a power distribution system, and a co-simulation method for a power distribution system. Background technique [0002] With the rapid development of electronic technology, IC (integrated circuit) is developing towards higher power consumption, lower voltage and higher integration. The complexity of PCB (printed circuit board) design is gradually increasing, and electronic systems are moving towards Developing in a high-speed direction. When the number of high-speed switching devices continues to increase and the power supply voltage gradually decreases, fluctuations in the power supply voltage and ground potential will have a fatal impact on the high-speed system. Therefore, the design of Power Integrity (PI, Power Integrity) has become the focus and bottleneck of the...
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IPC IPC(8): G06F17/50
Inventor 高剑刚贾福桢胡晋金利峰刘耀李川王彦辉
Owner JIANGNAN INST OF COMPUTING TECH