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CMX991 RF Quadrature (I/Q) Transceiver

CMX994 RF Direct Conversion Receiver

CMX7031, CMX7041 Two-Way Radio Processor: Voice, Signalling and Data

CMX7131/CMX7141 Digital PMR Processors

CMX992 RF Quadrature/IF Receiver

CMX993/CMX993W RF I/Q Modulator

CMX7032/CMX7042 AIS Baseband Processors with RF Synthesisers

CMX981 Advanced Digital Radio Baseband Processor

CMX998 Cartesian Feedback Loop Transmitter

CMX990 GMSK Packet-Modem and Tx/Rx

EV9910B CMX991 EvKit

EV9920B CMX992 EvKit

EV9930/EV9930W CMX993, CMX993W EvKit

EV9980 Cartesian Feed-back Loop Transmitter EvKit

EV9900A Evaluation Kit for CMX990


CMX991 RF Quadrature Transceiver IC for High Performance (100MHz to 1GHz RF)
CMX991

RF Quadrature Transceiver
Features:
  • High Performance (100MHz to 1GHz) RF Transceiver
  • Half-duplex Operation
  • Rx
    • RF Mixer with Output Select
    • 1st IF Input Select
    • 1st IF Variable Gain Amplifier (VGA)
    • 1st IF Signal Level Indicator (SLI)
    • Two-mode Demodulator
    • I/Q Zero IF with Diferential Outputs
    • Selectable IF Outputs (450kHz or 455kHz)
  • Tx
    • I/Q Modulator to IF
    • Image-reject Up-converter
    • IF and RF Outputs
  • IF
    • IF LO Synthesiser
    • IF VCO Negative-Resistance Amplifier
  • 3.3 V Low Power Operation
Applications:
  • Analogue, Digital and Multimode Radio
  • Software Defined Radio (SDR)
  • Portable, Mobile and Base Station Terminals
  • Data Telemetry Modems
  • TETRA
  • ETSI:
    • EN 300 113, EN 301 166, EN 302 561,
      EN 300 220, TS 102 361 (DMR)
  • APCO Project 25: Phase 1 and Phase 2 TDMA:
    TIA-102.CAAB
  • Automatic Identification System (AIS) Transponders
  • Constant Envelope and Linear Modulation
  • Compatible with CMX998 (Cartesian Feedback Loop Transmitter)
  • Narrowband Systems: eg. 25kHz, 12.5kHz and 6.25kHz
  • Wideband Systems: eg. up to 2MHz
  • Satellite Communications
Packages:
  • CMX991Q3 - 48-pin VQFN
Supply Requirement:
  • 3.3V
Description
The CMX991 is a single-chip, high performance, RF transceiver that provides the core functions required to implement a full-featured radio transmitter and receiver. It operates from 100MHz to 1GHz and its I/Q architecture supports multiple modulation types and bandwidths with a single radio design.

The half-duplex CMX991 integrates Tx modulators, Rx demodulators, IF PLL and IF VCO subsystems to minimise the external circuits needed when implementing a complete transceiver.
User-selected modes suit different application requirements.

The Tx path includes an I/Q modulator to accurately generate modulation at the IF frequency, which may then be translated to the final RF frequency by an integrated image-reject up-converter system.
The I/Q modulator IF output is also made available for conversion to RF via external circuits, if desired.

The Rx path includes an integrated 1st Rx mixer having two outputs to support two external 1st IF filter choices, then an integrated 2:1 input MUX followed by VGA and wideband signal level measurement functions, to support AGC implementation.
The 1st IF signal is then either I/Q demodulated to Zero-IF or mixed to a Low IF output.
The CMX991 provides differential and single-ended Rx output options and differential amplifiers for flexible signal conditioning.

The CMX991 can be used where highly linear modulations are being used, for example: applications such as TETRA, where a typical transmitter solution would include the CMX998 Cartesian Feedback Transmitter.

New application note facilitates operation of the CMX991 below 100MHz.

 

Block Diagram

CMX991: a high performance, RF transceiver that provides the core functions to implement a full-featured radio transmitter and receiver

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