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Med-net radio link aimed at implantable medical devices

Posted: 25 Feb 2013 ?? ?Print Version ?Bookmark and Share

Keywords:radio module? RF transceiver? med-net radio link?

Microsemi Corp. has debuted a medical network (med-net) radio link for implantable medical devices that include pacemakers, cardiac defibrillators and neurostimulators. The device is composed of the company's ZL70321 implantable radio module and its ZL70120 base station radio module for external device controllers.

Both modules are based on Microsemi's ultra-low power (ULP) ZL70102 medical implantable communications service (MICS) band radio transceiver chip, which supports a very high data rate RF link for medical implantable communication applications. The firm added that the ZL70321 implements all RF-related functions needed to deploy the implant node in a MICS RF telemetry system. The integrated antenna tuning circuit allows the module to be used with various implant antennas (nominal antenna impedance is 100+j150).

The module features the ZL70102-based MICS RF transceiver with integrated matching network, and SAW filters for suppression of unwanted blockers and antenna tuning. It also touts 2.45GHz wake-up receiver matching network, integrated 24MHz reference frequency crystal and decoupling capacitors.

The ZL70120 base station radio module also includes all RF-related functions required to deploy the external device functions in a MICS-band RF telemetry system. It is designed to meet regulatory requirements including FCC, ETSI and IEC. Additional features include integrated matching network, bandpass filters for suppression of unwanted blockers and an extra receiver LNA for maximised receiver sensitivity. It also offers 2.45GHz wake-up transmitter and antenna matching network, RSSI filter and logarithmic amplifier simplifying clear channel assessment (CCA) required by the MICS standard, 24MHz XO reference frequency for the 400MHz and 2.45GHz sub-systems, and fully shielded package.

Microsemi's ZL70102 allows patient health and device performance data to be quickly transmitted with little impact to the useful battery life of the implanted device. The device operates in the 402-405MHz MICS band. Multiple ULP wake-up options are supported including a 2.45GHz ISM band wake-up receiver. The ZL70102 consumes less than 6mA when transmitting or receiving data, only consumes 290nA when in listen before transmit mode and has a sleep mode that consumes just 10nA.

Microsemi's med-net radio solution is available.

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