Product category: Communications ICs (Wireless)
News Release from: CML Microcircuits | Subject: CMX998
Edited by the Electronicstalk Editorial Team on 14 August 2006
Transmitter chip keeps radio outputs in
line
Cartesian feedback loop transmitter IC provides global two-way radio manufacturers with a highly integrated solution for transmitter linearisation.
CML's new CMX998 Cartesian feedback loop transmitter IC provides global two-way radio manufacturers with a highly integrated solution for transmitter linearisation With the world going digital, the need for increased data speeds and bandwidth efficiency is ever increasing, driving the move to more complex linear modulation schemes
This article was originally published on Electronicstalk on 11 Feb 2004 at 8.00am (UK)
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The CMX981 is an extremely-low-power advanced digital-radio baseband processor, combined on-chip with a voice codec/processor and an audio PA.
The CMX998 provides a fully integrated low power solution, ideal for portable devices.
The new CMX998 represents a state-of-the-art solution, covering a wide RF range from 100MHz to 1GHz, usable with channel bandwidths up to 150kHz.
Not only is flexibility offered, but high performance, low wide-band noise and a large degree of linearisation gain too.
Suited to the majority of nonconstant envelope modulation systems, the CMX998 is ideal for today's flexible, multimode software defined radio (SDR) systems, significantly improving the efficiency and linearity of transmitters and can support a wide range of linear modulation formats and standards, including TDMA operation, Tetra mobile station power classes up to 3W (Class-3), APCO P25, Tetra 2 terminals, aviation systems, mobile satellite terminals and more.
With the CMX998 being an analogue system, it will reproduce whatever modulation is presented to its I and Q inputs such as: analogue FM, PSK, QPSK, DQPSK, QAM, ODFM.
The CMX998 provides all of the functions needed to implement a Cartesian feedback loop transmitter in a two-way radio design, with the addition of an external power amplifier, coupler and fixed value feedback attenuator.
Acting as a direct conversion quadrature mixer from I and Q to RF output, it provides the capability to linearise the PA via a feedback from the PA's output.
Included are forward and feedback paths; local oscillator circuitry including loop phase control; instability and error detectors along with uncommitted op-amps for input signal conditioning.
The CMX998 integrated IC solution is available now, operates at 3V and comes in a 64-pin VQFN package with an added thermal ground pad to aid thermal performance.
The CMX998 offers the designer ultimate performance, flexibility, small size and fast time to market.
An evaluation kit (EV9980) and support tools are also available for the CMX998.
The guide price for the CMX998 is $10.90.
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