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Quadrature Demodulator with IF PLL VCO

CMX972 - RF Building Block


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Click resource title to access in full CMX972 Product Preview
Full access to this resource is only granted to logged in users CMX972 Datasheet

 Features:

  • 20 – 300MHz IF/RF Demodulator
  • 10MHz Rx I/Q Bandwidth
  • < 1 degree I/Q Phase Matching 
  • < 0.5 dB I/Q Gain Matching
  • Low Power, 3.0V – 3.6V Operation
  • Small 32-lead VQFN Package

 Applications:

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

Supply Requirement:

  • 3.0 to 3.6 V power supply

The CMX972 features a low-power quadrature IF/RF demodulator with 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.

CMX972 Block Diagram

Design Support Information

 
Full access to this resource is only granted to logged in users 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.
Full access to this resource is only granted to logged in users 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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