RF Modules Rocket Medical Implants To Market

Microsemi’s ZL70123 radio frequency (RF) base station module for implantable devices operates in the Medical Implant Communication Service (MICS) RF band. Combined with the company's ZL70323 implant module, it provides a complete system for use in next-generation medical networks (Med-Net). Both modules are based on the latest generation of the company's ultralow power (ULP), MICS-band, radio transceiver chip.


The Med-Net radio operates in the 402 MHz to 405 MHz MICS band. Multiple ULP wake-up options are supported, including a 2.45-GHz, industrial, scientific and medical (ISM) band, wake-up option.


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The existing Microsemi ZL70323 implant module implements all RF-related functions needed to deploy an implant node in a MICS-band RF telemetry system. It consumes less than 6 mA when transmitting or receiving data and consumes 10 nA when in its sleep state. The integrated antenna tuning circuit allows the module to be used with a wide range of implant antennas (as nominal antenna impedance is 100+j150 Ohms). The module includes the following blocks:

  • ZL70103-based MICS-band RF transceiver with integrated matching network, SAW filters for suppression of unwanted blockers and antenna tuning
  • 2.45-GHz wake-up receiver matching network
  • Integrated 24 MHz reference frequency crystal
  • Decoupling capacitors 

The ZL70123 base station module includes all RF-related functions required to deploy external device functions in a MICS-band RF telemetry system. It is designed to meet regulatory requirements including Federal Communications Commission (FCC), European Telecommunications Standards Institute (ETSI) and International Electrotechnical Commission (IEC) standards. Additional features include:

  • Integrated matching network with a nominal 50 Ohm RF port;
  • Bandpass filter for suppression of unwanted blockers;
  • 2.45 GHz wake-up transmitter with a nominal 50 Ohm RF port; and
  • Fully shielded, 18 mm × 12 mm x 3 mm package. 

Microsemi's ZL70123 RF base station module is in production and available now. The company also offers an application development kit, part number ZLE70103BADA. A plethora of additional information is available.