Product description

An RF power amplifier (RF PA) is a key part of any RF transmitter line up with size, efficiency and overall performance being important factors.

The CMX901 is a three stage high-gain and high efficiency RF power amplifier. The device is ideally suited for use in VHF and UHF frequency bands from 130MHz to 950MHz.

The first and second stages of the amplifier operate in a class-A and class-AB mode respectively, and the third stage operates in a class-C mode for maximum efficiency. The input and output matched circuits are implemented via external components and therefore can be adjusted to obtain maximum power and efficiency at the desired operating frequency.

The CMX901 is available in a small footprint 5mm x 5mm low thermal resistance 28-pin WQFN package.

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  • Wide operating frequency range 130MHz to 950MHz
  • Typical output power
    – 2.5W operating at 160MHz
    – 1.8W operating at 435MHz
    – 1.5W operating at 915MHz
  • High power gain up to 40dB
  • High power added efficiency up to 60% at VHF
  • Single polarity supply voltage 2.5V to 6V
  • Small 28 pin WQFN package


  • Wireless data communications FSK, FFSK/MSK, GFSK/GMSK, Multi-level FSK
  • Marine AIS Class-B and Marine AIS-SART
  • RFID readers/writers
  • Automatic meter reading (AMR)
  • Wireless sensor networks Mesh/Ad hoc systems
  • Remote control and sensing systems
  • Commercial and consumer communications

Power supply requirement

  • 2.5 to 6 V

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Design resources

EV9011/EV9021 Evaluation Kit

EV9011/EV9021 The EV9011/EV9021 are Evaluation Kits for the CMX901 and CMX902. These products are wideband RF power amplifiers with high efficiency and high gain and may be used as  power amplifiers or driver amplifiers.


EV9011+EV9021_Product_Preview (rev 1)

EV9011_EV9021_User Manual (Rev1)

Knowledge Base

EV9011-160 Board Schematics. Hi-res schematic for EV9011-160 Evaluation Kit 160MHz variant. Version A02.
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EV9011-435 Board Schematics. Hi-res schematic for EV9011-435 Evaluation Kit 435MHz variant. Version A01.
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EV9011-915 Board Schematics. Hi-res schematic for EV9011-915 Evaluation Kit 915MHz variant. Version A01.
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EV9011/EV9021 Support Pack. Gerbers, tooling, layer stack and BOM for the EV9011/EV9021 Evaluation Kit. Version A01. – Please register or login to download

Package: QT8

28-pin WQFN

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