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


RF (Support) Products
A range of RF products offering modular building blocks for implementation as part or all of the 'wireless front-end' of a wide range of constant and non-constant modulation systems
Radio Frequency (RF) Products
CML's range of Radio Frequency (RF) products provides a selection of modular building blocks for implementation as part or all of the 'wireless front-end' of a wide range of constant and non-constant modulation systems.

With an operating frequency range of 100MHz to 1GHz, these products offer: a combination RF transceiver, a separate RF modulator and receiver and a Cartesian feedback loop transmitter for efficiency and signal linearisation.

Applications:
  • Narrowband data-over-radio: FFSK/MSK/FSK/GMSK/QPSK/QAM
  • Linear and non-linear modulation schemes
  • Wireless telemetry
  • Marine AIS systems
  • Software Defined Radio (SDR)
  • Satellite terminals
  • Digital TV - CATV modulators
  • Wi-Max implementations
  • Analogue/digital and multimode radio (TETRA, APCO)

< < < < < Please use the links on the left to view the relevant product overviews

Product Comparisons
Product Features Modn Scheme Compatibilty Supply
CMX991
RF Quadrature Transceiver		 High performance Rx/Tx in
100MHz to 1GHz range		 Constant Envelope and
'Slightly Linear'		 3.0 to 3.6 Volts
CMX992
RF Quadrature/IF Receiver		 High performance RF receiver in
100MHz to 1GHz range.
(compatible with CMX998)		 Linear and
Constant Envelope
CMX993/CMX993W
RF Quadrature Modulator		 Low voltage quadrature (I/Q) modulator (30MHz to 1000MHz).
Matched double-balanced mixers driven from a buffered, quadrature split local oscillator. (compatible with CMX992) 		Constant Envelope
CMX994
RF Direct Conversion Receiver		 LNA with Gain Control
100MHZ to 1GHz I/Q demodulator Precise filtering with bandwidth setting
Versatile LO synthesiser 		Linear and
Constant Envelope
CMX998
Cartesian Feed-back Loop Transmitter		 Direct conversion quadrature mixer from
I and Q to RF output		 Linear
CMX7032
AIS Class B and Rx-Only Baseband Processor		 A half-duplex, AIS baseband signalling processor with two on-chip RF synthesisers GMSK and FSK
CMX990
GMSK Modem and RF Transceiver		 Integrated RF, IF and Synthesiser sections. (400MHz to 1GHz Range) GMSK
Constant Envelope
CMX981
Advanced Digital Radio Baseband Processor		 Radio and Audio Codec Suite
with Digital Channel Filters		 Linear and
Constant Envelope		 2.5 Volts

Evaluation Example
The EV9910B allows the evaluation of the CMX991 Quadrature/Low IF Transceiver.
The CMX991 is an RF Transceiver IC providing an I/Q modulator and up-converter, superheterodyne receiver and IF local oscillator.

Access is provided to all CMX991 RF, baseband and control signals by either connectors or test points.
Test access points are available to accept common test equipments, such as RF and baseband signal generators and spectrum analysers.
All signal paths are matched by suitable components.
The EV9910B provides an optional lumped bandpass filter plus buffer amplifier at 460MHz (default) to aid evaluation. The overall evaluation frequency range of this Evaluation Kit is for RF frequencies between 100MHz and 1GHz, with default operation over 450MHz to 470MHz.

In the form of a populated PCB, this flexible Evaluation Kit enables users to configure and evaluate the CMX991 device for various applications and frequency bands.
The on-board CMX991 is controlled via its C-BUS serial command/date interface. The PE0002 Interface Card is available separately to support PC-based control of the EV9910B.

The EV9910B: for the evaluation and investigation of the CMX991 Quadrature/Low IF Transceiver
Glossary
APCO A suite of standards for digital radio communications for use by federal, state/province and local public safety agencies in North America.
CFBL Cartesian Feedback Loop: The section of a (Radio Frequency) control system that uses feedback and self-correction indication to adjust its operation in-line with the measured and the desired signal output.
DCRx Direct Conversion Receiver. Where the wanted RF signal is mixed down to a low-IF or zero- IF frequency.
DQPSK Differential Quadrature Phase Shift Keying: a modulation technique in which the carrier can assume one of four phases, each change of phase, or symbol, represented by 2 bits.
FFSK Fast Frequency Shift Keying: also known as Minimum Shift Keying (MSK) - A form of frequency modulation.
FSK Frequency Shift Keying: a form of frequency modulation used to transmit two states of a signal each as separate frequencies.
FSK is characterised by a frequency spacing of 1.
GFSK Gaussian Filtered Frequency Shift Keying: an FSK modulation scheme with a Gausian filtered output signal.
GMSK Gaussian Minimum Shift Keying: a type of FSK that uses pre-modulation Gaussian filtering to achieve high data rates in an FM communications channel bandwidth.
Modulation The process of modulation of a carrier or signal for transmission, also the result of this process. The addition of information (or the signal) to an electronic or optical signal carrier.
MSK Minimum Shift Keying: continuous phase FSK modulation (also known as FFSK) used to transmit two states of a signal as two separate frequencies using coherent detection and a frequency spacing of 0.5.
QAM Quadrature Amplitude Modulation: a hybrid amplitude/phase modulation technique that allows the transmission of four bits of information during a signalling interval, and requires less bandwidth than normal amplitude or phase modulation techniques.
RF Radio Frequency: generally accepted to range from about 3 kilohertz to about 300,000 megahertz.
TETRA TErrestrial Trunked RAdio: an open digital standard for radio communications defined by the European Standards Institute (ETSI).