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RF Building Blocks

CMX973 – RF Quadrature Modulator/Demodulator

The CMX973 is a high performance RF quadrature modulator/demodulator featuring a wide operating frequency range and attractive power consumption.

The CMX973 forms the basis of a high-performance RF transceiver system combining a flexible IF/RF quadrature modulator and quadrature demodulator.

Wide signal bandwidth at RF, 0dBm output, low noise and serial bus control delivers maximum flexibility and high-performance, at a low operating power. It is suitable for superheterodyne architectures with IF frequencies of 20MHz to 300MHz and may be used in low IF systems or those converting down to baseband.

The modulator converts directly from baseband to the desired transmit frequency 20MHz to 1GHz and features quadrature phase correction to minimise unwanted spectral components.

The differential inputs are ideal for direct connection to standard modems and interface ICs such as CML’s CMX7163 QAM Data Modem, CMX910 AIS Baseband Signal Processor, CMX981 Digital Radio Baseband Processor and more!

Devices are available through our Distributor Network.

CMX973_block_diagram

Features

20 – 300MHz IF/RF Demodulator
10MHz Rx and 25MHz Tx I/Q Bandwidth
20 – 1000MHz RF Modulator 0dBm Modulator Output
< 1 degree I/Q Demod Phase Matching
< 0.5dB I/Q Demod Gain Matching
IF PLL and VCO amp
Low Power Mod/Demod 61mA/15mA @ 3.3V
Small 32-pin VQFN Package

Applications

Wireless Data Terminals
HF/VHF and UHF Mobile Radio
Avionics Radio Systems
Telemetry Modems
Wireless Microphones
Software Defined Radio (SDR)
Satellite Terminals

Power Supply Requirement

3.0 to 3.6 V power supply

Downloads

CMX973-Product-preview-june-2012 CMX973-data-sheet

Design Resources

Application Notes Video Evaluation Kit Knowledge Base Package

Frequency Estimation for a VCO using a Negative Resistance Amplifier

Application Note describing how to estimate the operating frequency of VCO designs using a negative resistance amplifier. An Excel spreadsheet that automates the calculation is available below.

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Excel Spreadsheet - Frequency Estimation for a VCO using a Negative Resistance Amplifier

An Excel spreadsheet that calculates the operating frequency of VCO designs using a negative resistance amplifier. An Application Note describing the process is available above.

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