Product description

Two separate, high performance, RF quadrature modulator ICs: the standard CMX993 and the wide bandwidth CMX993W product variant.

The CMX993/CMX993W is an integrated, low voltage IQ quadrature modulator suitable for use in applications operating from 30MHz to 1000MHz.

The device integrates two matched double-balanced mixers driven from a buffered and quadrature split local oscillator. The LO frequency is divided by either a factor of 2 or 4. The mixers form an I/Q vector modulator with programmable gain stages offering up to 30dB of gain control in 2.5dB steps.

Uncommitted low frequency differential amplifiers are provided for users to configure. This may be used to implement functions such as filtering, differential to single ended signal conversion and level shifting.

A digital control interface, C-BUS, (an SPI compatible interface) allows gain control as well as power management of individual internal blocks to optimize system performance.

The C-BUS interface operates from its own supply domain enabling the device to be interfaced to different voltage baseband devices. The CMX993 and CMX993W devices are supplied in an RF optimized VQFN package.

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Block diagram


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  • High Performance (30MHz to 1GHz) RF Modulator
  • I/Q Modulator
  • Wideband Noise Figure: -148dB/Hz
  • Noise Floor: -155dBm/Hz
  • Programmable 30dB Output Gain Range
  • Output Power: +3dBm (PEP)
  • Low LO Drive Requirements: -15dBm
  • CMX993W – Wide Bandwidth Version
    (>50MHz I/Q Bandwidth)
  • Uncommitted Amplifiers for Filtering and Interfacing
  • C-BUS (SPI Compatible) Serial Control/Data Interface


  • APCO P25, Wireless Data
  • ISM Transmitters
  • Digital TV/CATV Modulators
  • Wireless LAN, Local Loop
  • IF or RF Modulators
  • FSK, GMSK, 4-Level FSK, C4FM, QPSK,
    QAM, SSB, OFDM and Multi-carrier Systems
  • Software Defined Radio (SDR)
  • Satellite Communications
  • Cellular Picocell/Nanocell Systems

Power supply requirement

  • 3.3V

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Design resources

CMX993: Simplified Output Match

CMX993: Simplified Output Match Application Note

GMSK data transfer using the CMX993, CMX7164 and CMX994.

Two scripts that exchange raw 9600baud GMSK messages transmitted by the CMX993 and received by the CMX994.

EV9930/EV99330W Evaluation Kit

EV9930 evkit EV9930 The EV9930 and EV9930W EvKits allow for rapid and full evaluation of the CMX993/CMX993W Quadrature Modulator IC by providing a populated pcb with access to all RF, baseband and control signals by either connectors or test points. EV9930_Product_Preview



C-BUS Guides

Guides to operation and interfacing

EV9930 Board Schematics

High resolution schematic for the EV9930 and EV9930W kits. Version B01

EV9930 Evaluation Software

EV9930 Evaluation Software. Requires a PE0003 Universal Interface Card. Version 4.1

EV9930 Quick Start

A simple guide to help users get started evaluating the CMX993 using the EV9930. Version 1

PE0003 Driver

PE0003 USB driver for Windows. Version 1.0

Package: Q3

48-pin VQFN

VQFN Design Guidance Notes

VQFN Design Guidance Notes

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