RF building-block IC; quadrature demodulator with PLL/VCO

May 02, 2013 // By Graham Prophet
The CMX972 Quadrature Modulator/Demodulator is the latest RF building block from CML Microcircuits, following on from the CMX970, CMX971 and CMX973 devices.

The new device features a low-power IF/RF Quadrature Demodulator with PLL/VCO, a wide operating frequency range and optimised power consumption. The demodulator is suitable for superheterodyne architectures with IF frequencies up to 300MHz and the device may be used in low-IF systems or in those converting down to baseband. An on-chip PLL and VCO, together with uncommitted baseband differential amplifiers, provide additional flexibility. Control of the CMX972 is by serial bus. The small, RF-optimised 32-pin VQFN package and minimal external components make the device ideal for space-constrained applications.

Features include; 20 to 300MHz IF/RF Demodulator; 10MHz Rx I/Q Bandwidth; under 1 degree I/Q Phase Matching; and under 0.5 dB I/Q Gain Matching. The chip offers a flexible RF building-block solution with excellent intermodulation performance, and phase/amplitude balance. Serial bus configuration is combined with simple interfacing to existing modem/baseband products.

CML Microcircuits, www.cmlmicro.com/products/CMX972_Quadrature_Demodulator_with_IF_PLL_VCO/