CML Microcircuits is targeting its new wideband RF I/Q modulator at the designers of cellular picocell/nanocell systems, satellite communications, broadband wireless access systems (WiMAX), microwave link transmitters (including ODFM/COFDM) 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 30 MHz to 1 GHz operation with excellent wideband noise performance across multiple modulations and bandwidths. It provides translation from baseband I/Q signals to a modulated RF signal; the wideband inputs (up to 100 MHz) can be driven single-ended or differentially. The chip also touts 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 the mixers forming an I/Q vector modulator with programmable gain stages, offering 30 dB of gain control in 2,5 dB step increments.
Additional features include 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. The CMX993W operates at 3,3 V (1,8 V I/O) and comes in a 48-pin VQFN package. For designers wishing to experiment with the product in their designs, an evaluation kit (EV9930W) is available.
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