The CMX991 is a single-chip, high performance, low cost RF quadrature 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 RF transceiver chip.
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.
Devices are available through our distributors below:
EV9910B/EV9920B and CMX91 Questions
Q. What spurious response rejection can I expect from the EV9910B/EV9920B receiver?
A. The EV9910B/EV9920B has been tested for receiver spurious responses to EN300-113 with a 9600 baud GMSK modem.
The performance was limited only by the image rejection (approximately 30dB), other rejections being greater than the required 70dB.
The user may provide additional image filtering between the LNA and mixer input; this is detailed in the user manual.
This Application Note seeks to provide useful guidance on the use of the devices below 100MHz and contains details of how such operation can be demonstrated through component changes to the matching circuits on the EV9910B and EV9920B Evaluation Kits.
Using the EV9910B and EV9920B to evaluate the CMX991 and CMX992 RF ICs for the Chinese *Police Digital Trunking (PDT) system.
|EV9910B/EV9920B||The EV9910B allows the evaluation of the CMX991 Quadrature/Low IF Transceiver. The CMX991 is an RF Transceiver IC providing I/Q modulator and up-conversion, superheterodyne receiver and IF local oscillator.||EV9910_Product_Preview|
Guides to operation and interfacing
EV9910B high resolution schematics. Version D02
EV9910B Gerbers and BOM. Version D02
EV9910B Evaluation Software. Requires a PE0003 Universal Interface Card. Version 5.1
PE0003 USB driver for Windows. Version 1.0
VQFN Design Guidance Notes