Design of an analog channel for broadband high-dynamic acquisition system

Abstract

The complex electromagnetic environment today places a greater demand on the bandwidth and dynamic range of electronic measuring devices. In the case where the dynamic range of a high-speed ADC is limited, the same signal is amplified with different gains through multiple channels, and the signal is sampled synchronously by multiple ADCs, and then, the undistorted data frames with the largest magnification factor are selected by frame from multiple sampled data for restoration and merging (reconstruction) to improve the dynamic range of the signal acquisition and the real-time performance of sampling. In this paper, the working principle and key technologies of an analog channel for a broadband high-dynamic acquisition system are described in detail, and the relevant design indicators are tested and verified. The results show that the analog channel finally achieves the technical indicators including 300MHz bandwidth and 90dB input dynamic range.