A miniaturized FSK IF signal transceiver module

Software defined radio is the radio system to implement flexible communication system and communication function by using fixed hardware platform and software reconstruction, which is characterized to be universal, standardized, modularization, open and flexible . Due to the IF signal processing requirements, the small IF signal transceiver module with the structure of “FPGA+ADC+DAC” is designed based on bandpass sampling theory in this paper. This module generates FSK IF signal by the principle of DDS, performs digital down conversion(DDC) of the IF signal based on bandpass sampling and polyphase filtering, and realizes the synchronous demodulation of FSK signal within the FPGA. This module also provides a host extended interface to communicate with upper computers. According to the practical test, the bit rate is 1Mb/s, bit error rate is better than 10⁻⁶. This module consists of signal-chip FPGA, ADC and DAC, which has broad application prospects with the small size, low power, configurable and programmable feathers.