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By Paddock B.

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If the capacitive coupling can be neglected the model is reduced to a resistive net. Consequently, the complexity of the net is reduced which may save simulation time. 27 28 4 SUBSTRATE NOISE REDUCTION METHODS In this chapter an overview of noise reduction methods is given. 1 PCB with built in power supply decoupling For high performance designs there are special PCBs with dedicated metal layers for the power supply. In this kind of PCB the distance between the power supply metal planes are much smaller than for the signal layers.

It is seen that a high frequency is less attenuated than a low frequency and that the noise increases with 40 dB per decade in the frequency range of 2 MHz to 300 MHz. * substrate noise * VA/VD 0 [dB] −20 0 -20 −40 -40 Volts dB (lin) −60 -60 −80 -80 −100 -100 −120 -120 −140 100k f -140 100k 1x 1M 10x 10M 100x 100M Frequency (log) (HERTZ) 1g 1G 10G 10g [Hz] Figure 4: Magnitude response from the digital ground to the analog ground. In Fig. 5 the root mean square (rms) value of the voltage at the analog ground is shown as a function of the rise and fall time of the clock signal.

The capacitances C1 and C2 are both equal to 2 pF. 725 4 Backside Contact 3 (mm) Figure 2: Substrate with a digital and an analog circuit. L1 C1 C2 L2 VD R1 R2 VA R3 L4 L3 Figure 3: A simple model of a mixed-signal circuit. 53 The magnitude response from the digital ground VD to the analog ground VA is shown in Fig. 4. It is seen that a high frequency is less attenuated than a low frequency and that the noise increases with 40 dB per decade in the frequency range of 2 MHz to 300 MHz. * substrate noise * VA/VD 0 [dB] −20 0 -20 −40 -40 Volts dB (lin) −60 -60 −80 -80 −100 -100 −120 -120 −140 100k f -140 100k 1x 1M 10x 10M 100x 100M Frequency (log) (HERTZ) 1g 1G 10G 10g [Hz] Figure 4: Magnitude response from the digital ground to the analog ground.

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A guide to online information about Peltier thermoelectric coolers by Paddock B.


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