Wideband RF Quadrature Modulator Targets Wireless Infrastructure
CML Microcircuits is targeting its new wideband RF I/Q modulator IC at the designers of, broadband wireless access systems (WiMAX), microwave link transmitters (including ODFM/COFDM), cellular picocell/nanocell systems, satellite communications and any other wideband wireless infrastructure systems requiring high performance I/Q modulation.The new CMX993W is a highly integrated wideband quadrature modulator, specifically tailored to offer 30MHz to 1GHz operation with excellent wideband noise performance across multiple modulations and bandwidths. The quadrature modulator provides translation from baseband I/Q signals to a modulated RF signal; the wideband inputs (up to 100MHz) can be driven single-ended or differentially for optimum performance. The CMX993W also boasts two integrated and matched double-balanced mixers, driven from a buffered, quadrature, split local oscillator. The ‘LO’ frequency is divided by either 2 or 4, with mixers forming an I/Q vector modulator with programmable gain stages (offering a desirable 30dB of gain control in 2.5dB step increments).
Many additional features are included, such as gain control, uncommitted differential amplifiers, a digital control interface and an SPI compatible interface (for baseband devices of differing voltages). Advanced power management of individual internal blocks is also offered, giving optimum system performance under all conditions.
The CMX993W is available now, operates at 3.3V (1.8V I/O) and comes in a 48-pin VQFN package. For designers wishing to experiment with the product in their designs, an evaluation kit (EV9930) is available directly from CML.
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