RF modules speed time-to-market for implantable medical device designers
1/11/2013 10:32 AM EST
Microsemi Corp. has introduced a complete medical network
(med-net) radio link for implantable medical devices such as pacemakers,
cardiac defibrillators and neurostimulators.
The new radio link is comprised 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 high data rate RF
link for medical implantable communication applications.
Radio frequency technology is increasingly being used in a wide variety
of medical implantable applications including cardiac care,
physiological monitoring (e.g. insulin), pain management and obesity treatments.
The ZL70321 implantable module 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 a
wide range of implant antennas (nominal antenna impedance is 100+j150
Ω). The module provides the following major blocks a ZL70102-based MICS
RF transceiver with integrated matching network, SAW filters
for suppression of unwanted blockers and antenna tuning; a 2.45 GHz
wake-up receiver matching network; an integrated 24 MHz 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 maximized receiver
The module is equipped with a2.45-GHz wake-up transmitter and antenna
matching network while a RSSI filter and logarithmic amplifier simplify
clear channel assessment (CCA) required by the MICS standard. There is
also a 24-MHz XO reference frequency for the 400-MHz and 2.45-GHz
Microsemi's ZL70102 transceiver chip, which is used on both the
implantable and base station modules, 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
402–405 MHz MICS band. Multiple ULP wake-up options are supported
including a 2.45 GHz ISM band wake-up receiver. The ZL70102 consumes
less than 6mA when transmitting or receiving data, only consumes 290 nA
when in listen before transmit mode and has a sleep mode that consumes
Microsemi's new med-net radio solution is available now. The company also offers an application development kit (ADK) to qualified customers.
Visit Microsemi at www.microsemi.com
This article originally appeared on EE Times Europe.