CML Microcircuits’ BPSK Wireless Data Modulator Simplifies Design for Licensed Frequency Bands

August 23, 2019 Alix Paultre

CML Microcircuits introduced the CMX7146, a flexible data modulator that simplifies the design of transmit-only solutions using BPSK (binary phase shift keying) and differential BPSK modulation (also referred to as PRK, phase reversal keying, or 2PSK). The CMX7146 generates precise baseband analogue in-phase and quadrature signals with programmable signal filtering. This generates a high-accuracy signal suitable for up-conversion to an RF carrier of the user’s choice.

The CMX7146 offers better support for low speed BPSK modulation, providing extensive configuration in terms of data rates and modulation shaping, while enabling users to customize transmit frequencies and channel bandwidths using an external RF modulator. The solution serves applications like satellite IoT to monitor very remote equipment with relatively little telemetry.  BPSK’s benefits include being relatively simple to demodulate with high power efficiency. The CMX7146 operates from a single 3.3V supply and is provided in a 48-lead QFN package.

The CMX7146 supports raw (bits in, modulation data out) and preloaded (messages in, modulation data out) transmissions and features a transmit trigger input to enable precisely timed data transfers. A power amplifier ramping DAC can be employed to control transmission bursts, which can be synchronized as part of the transmit sequence. To increase flexibility in sensor interfacing and IIoT solutions, the CMX7146 integrates low power analogue to digital converters and four GPIO interfaces.

CML's FirmASIC technology defines device functionality with a small configuration file loaded at power-up, increasing the flexibility and lifetime of an end-product with functionality upgrades such as alternative modulation schemes or over air protocols. In a typical system, the CMX7146 may be paired with CML's CMX971 IQ modulator or CMX973 transceiver and a low-cost flash microcontroller, for a solution that supports transmit frequencies from 100MHz to 1000MHz.  Higher frequency systems can be supported by using alternative up-converter solutions.

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