Existing digital IF technology restricts implementation in semiconductor devices to afford the complicated operations. Two major suppliers of digital IF products are Gray Chip and Harris Semiconductor. Blue Wave Systems adopts Harris's H5P50214 digital downconverter to produce 5B34 10 digital IF receiver which can convert the signal from IF 70 MHz to baseband. Based on the structure of H5P50214 in 5B3410, we design a bank of filter coefficients and corresponding decimation factors to implement the CDMA digital IF receiver that meets IS-95 CDMA requirements. We also conduct simulation for received signal and hardware implementation.
Digital IF receiver Programmable downconverter