Noise on Vcc and its effects on ICs

Broadcasted on 1/25/2012

Bob Muro

Wireless Telecom Group

Noise on Vcc and its effects on ICsModern integrated circuits contain billions of transistors that require complex power distribution systems. This power distribution complexity combined with inexpensive switch-mode power supplies creates several sources of noise found on the power and ground planes of a PC circuit board. This interference is difficult to model using software and contributes to jitter timing problems within the IC. The Noisecom JV9000A is designed to generate random and deterministic noise on the power and ground planes to emulate this behavior. The webinar illustrates how the JV9000A can be used to generate these effects in real systems.

This webinar has ended and can be viewed by clicking on the View The Recording button.

Webinar Q&A

Below are questions we received during the webinar. If you have any additional questions, email us.

How much power is required to disturb my device?

The power required will depend upon your DUT input impedance, but the JV9000A series typically has enough power at 1Watt to provide the required energy.

Why is ground bounce such a problem?

The large dynamic current change through the stray inductance causes the absolute ground plane reference to vary.

Why is noise an important signal for my interference signal input?

There are two primary reasons:

  1. It should be used to measure the overall test system noise floor, mostly based on receiver dynamic range sensitivity
  2. It can be used as an input signal to measure the DUT input impedance variation over frequency when characterizing the actual voltage delivered to the DUT.

What if my test device requires frequencies different from the standard JV9000A?

No problem, Noisecom can provide a custom solution with respect to noise band frequency, CW tones, and maximum power output.

Is a bias-Tee the only connection type for injecting Noise onto my IC Vcc power input?

No, and good question. Depending upon the input impedance of the DUT, a standard 50Ω coaxial, or a impedance transformer type connection could be used. The standard JV9000A series uses a bias-Tee to couple the interference onto the DC power supply signal.