Wideband RF Quadrature Modulator Targets Wireless Infrastructure

Wideband wireless infrastructure systems requiring high performance I/Q modulation are targets for the CMX993W, a highly integrated wideband quadrature modulator, specifically tailored to offer operation from 30 MHz to 1 GHz with excellent wideband noise performance across multiple modulations and bandwidths. Applications include broadband wireless access systems (WiMAX), microwave link transmitters (including ODFM/COFDM), cellular picocell/nanocell systems, and satellite communications. The quadrature modulator 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 for optimum performance. The CMX993W also boasts two integrated and matched double-balanced mixers, driven from a buffered, quadrature, split local oscillator. The local-oscillator (LO) frequency is divided by either 2 or 4, with mixers forming an I/Q vector modulator with programmable gain stages (offering a desirable 30 dB of gain control in 2.5-dB step increments). The CMX993W is available now, operates at 3.3 V (1.8-V I/O) and comes in a 48-pin VQFN package. An evaluation kit (EV9930) is available. CML MICROCIRCUITS, Maldon, Essex, U.K. + 44 1621 875500.