Hardware design of data acquisition and processing of digital IF receiver

The intermediate frequency (IF) signal solution hardware scheme of software defined radio which based on DDC and DSP is formulated. Signal conditioning circuit composed of OPA842 and AD8138 ensures the analog input to ADC AD6644 is differential and low noise. In design DDC HSP50214B realizes frequency conversion and rate conversion, it lowers the sampling rate and filters the signal to process for following. The buffer of data transmission between DDC and DSP is composed of two FIFOs. According to the structure of hardware the mode of data transmission and access timing of FIFO are analyzed.