RF quadrature modulator

18 February 2009 Telecoms, Datacoms, Wireless, IoT

The new CMX993 from CML Microcircuits is a general purpose RF quadrature modulator offering 100 MHz to 1 GHz operation and excellent wideband noise performance. Targeted to meet the challenging requirements of wireless data (digital TV, CATV modulators, ISM transmitters, wireless LAN, WLL) and two-way radio systems (APCO P25), the product’s I/Q architecture supports a wide range of modulation types. The device offers 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 steps. A digital control interface, C-BUS (SPI compatible interface), allows gain control as well as the power management of individual internal blocks for optimum system performance.

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