Protect antennae in wireless devices from ESD strikes

June 10, 2013 // By Graham Prophet
Infineon's latest Transient Voltage Suppressor (TVS) diodes protect antennae and front-end devices from transient voltage events. The new ESD101x and ESD103x diodes absorb dangerous electrostatic discharges (ESD) to prevent damage to the antenna system while maintaining signal integrity.

Optimised features for antenna protection include a symmetrical bidirectional configuration with a very low capacitance of only 0.1pF to avoid mismatch and insertion loss. ESD101x and ESD103x offer high linearity as required by TX and RX systems. In order to be compliant with various regulations regarding electromagnetic compatibility (e.g. ETSI EN 300 328), harmonic generation is minimised. Furthermore, intermodulation distortion is kept low to avoid in-band interference and jamming of the other radio services.

Due to their minimal power consumption – with typical leakage current below 0.1nA at working voltage in normal operating mode – the new diodes help to prolong battery life in portable electronic systems.

Antennae are often situated on easily accessible spring-mounted contacts on the surface of a cell phone, making it susceptible to ESD events that can easily pass into the module and damage or destroy its components. ESD101x and ESD103x are placed in the signal path between antenna and RF front-end. They are optimised to balance between efficient protection as well as high signal integrity and linearity which is very important for the RF signal line. The new diodes can withstand repeated ESD strikes according to the IEC61000-4-2 industry standard without any performance loss and react to multiple discharges within less than 1 nsec.

ESD101x and ESD103x are available in volume quantities in the standard package TSSLP-2-3 (0.6 x 0.3 x 0.3mm)

Infineon; www.infineon.com/esdprotection