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EMI filter targets wireless handsets

Posted: 06 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:CM1460? EMI filter? ESD protection? California Micro Devices? Gina Roos?

CM1460 Praetorian EMI filter

California Micro Devices has launched its next generation of Praetorian EMI filter with ESD protection for wireless handsets.

Offering excellent filter performance and a high level of ESD protection, the CM1460 offers a roll off of 20dB/octave and attenuation greater than 30dB between 800MHz and 3GHz with a typical corner frequency of 300MHz. In addition, the CM1460 features ESD protection up to 15kV contact discharge per IEC61000-4-2 Level 4 specification and 30kV using the Human Body Model.

This high-performance single-chip solution based on a 3-pole L-C (inductor-capacitor) architecture leverages the company's proprietary Praetorian process technology that allows for the integration of spiral inductors on silicon. Each channel of the CM1460 consists of a 3 pole L-C filter with a minimal inductance value of 17nH and nominal capacitor value of 15pF. The insertion loss is much lower than R-C (resistor-capacitor) filters, typically less than 1dB.

To accommodate various interface configurations, the CM1460 is available in 4-, 6- and 8-channel versions. The device is housed in a lead-free, thin DFN (TDFN) package featuring a typical height of 0.75mm and body sizes of 2-by-2mm, 3-by-1.35mm and 4-by-1.6mm for the 4-, 6- and 8-channel versions, respectively.

The CM1460 provides EMI filtering and ESD protection for interfaces connecting the host processor to the camera and display modules in wireless handsets in a single chip compared to using ceramic filters that require the use of external ESD protection devices. In popular clamshell and slider phone configurations, such interfaces are typically routed on a flexible PCB, which are vulnerable to EMI radiation and potential ESD strikes.

In addition, as data rates increase and signal integrity requirements become stricter, the use of traditional EMI filters based on R-C architectures results in significant signal degradation which may lead to potential application issues such as visible data corruption on the display, said the company.

Pricing starts at 34, 43 and 52 cents in quantities of 1,000 for the 4-, 6- and 8-channel configurations, respectively. The CM1460 is currently sampling with volume production scheduled for second quarter 2006.

- Gina Roos

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