The loss of down converter for digital radar receiver
Youn-Hui Jang, Hyun-Ik Shin, Bum-Suk Lee, Jeong-Hwan Kim, Whan-Woo Kim · International Conference on Signal Processing · 2008
With the development of digital processing technology, digital receivers have wide applications in radar systems as well as wireless communications systems. In the digital receivers with intermediate frequency (IF) sampling technique, the analog-to-digital converter (ADC) directly converts IF signal into digital format prior to detection. And the digital signal processor (DSP) using Hilbert transform or the digital down converter (DDC) using the direct digital synthesizer extracts in-phase (I) and quadrature (Q) components from the digital data. In this paper, a digital radar receiver with GC4016 DDC chip is presented. We propose the operating modes and design parameters of the DDC satisfying system requirements and analyze the DDC loss.