SAϕIC™ Technology – The New Way To Compliance
LFC Semiconductor’s proprietary SAϕIC™ technology is a revolutionary “Next-Gen” approach to Active EMI / RFI Management (see “An Introduction to Active EMI / RFI Management”).
SAϕIC™ - (pronounced “Safic”) stands for “Safe Phase Modulation IC” and incorporates all the benefits of Active EMI / RFI management while overcoming the many limitations of the older 1st-Gen methods.
Older Generation Implementations:
The most widely used architecture for 1st
-Gen Active EMI management is PLL (Phase Locked Loop) based.
The PLL is used to frequency modulate a periodic signal thereby “spreading” the energy over a wider band and reducing peak emissions. The output frequency is proportional to the ratio of the feed-forward and feedback counter values (M/N) and the modulation is achieved by modifying this ratio either in a pre-determined manner or randomly (dithering).
Figure 1 – PLL Based Implementation of Active EMI Management
Limitations of 1st Generation Active EMI Management
1st Generation Active EMI Management implementations offer highly effective EMI / RFI suppression in certain applications where there are
- relaxed system timing requirements (low frequency) due to the intrinsic jitter caused by the PLL.
- no requirements for functional compliance / certification for interoperability as in USB or HDMI
- no strict constraints on power consumption (non-mobile applications)
In addition to these limitations most devices based on PLL architectures exhibit large part-to-part variations
due to the large Analog content in the chip, which can often lead to system failure in the field.
These limitations have been the prime reason for the lack of adoption of Active EMI management in many applications like mobile phones, tablets, netbooks to name a few.