Picor Corporation • www.picorpower.com

QPI-10 Data Sheet Rev. 1.4 Page 3 of 8

Applications Information

The QPI-10 is an EMI filter especially designed for

V•I Chip products, providing conducted common-mode

and differential-mode attenuation from 150 kHz to 30

MHz. Designed for the telecom and ITE bus range, the

QPI supports the PICMG

system boards using Vicor’s V•I Chip technology to the

EN55022 Class B limit.

The resulting plot in Figure 4 shows the QPI-10 is

effective in reducing the V•I Chip total noise spectrum

to well below the EN55022 Class B Quasi-peak

detection limit.

The plot in Figure 4 was taken using the standard

50 / 50 µH LISN and measurement conditions, with the

Peak detection mode of the spectrum analyzer, for a

conducted EMI test. The results are compared to the

CISPR22 EN55022 Class B Quasi-peak detection limit

showing the total noise spectrum for V•I Chip

combination using a P048K048T24 and V048K120T025

with a QPI-10 connected, as shown in Figure 3.

Figure 3 – Standard LISN test setup, 170 W load.

Figure 4 – Conducted EMI profile of V•I Chip with QPI-10.