The DE9941 is a small demonstration platform for the CMX994 Direct Conversion Receiver, the CMX998 Cartesian Loop Transmitter and the CMX7164 Multi-mode Wireless Data Modem.
The DE9941 can be used to demonstrate Tx and Rx performance with QAM modulation, FSK and GMSK type modulation. Together with the PE0003 host controller, a full transceiver can be demonstrated using a Function Image and control scripts.
The DE9941 provides a Fractional-N PLL and VCO plus associated circuits to provide local oscillator signals for the CMX994/E and CMX998. The PE0003, together with the control scripts, gives the user the ability to program the RF synthesiser to the correct operating frequencies.
The design also includes a 1W power amplifier, harmonic filter and Tx/Rx switch. The RF performance is designed to be compliant with EN 302 561 and EN 300 113, all the circuits are provided with power-down capability to allow standby functionality.
