Abstract
Time interleaving is one of the most efficient techniques employed in high-speed sampling systems. However, the frequency response mismatch among different channels will create distortion tones that degrade the system performance. In this paper, a self-adaptive frequency response mismatch compensation method is presented, where the design of compensation filter is optimized with a self-adapting strategy. This digital postprocessing technique realizes the compensation of frequency response effectively and also the increase of the digital bandwidth of the acquisition system. MATLAB-based simulation and an actual two-channel acquisition system test verify the effectiveness of the algorithm.
Highlights
High-speed digitizing of signals plays an important part in broadband communication and electronic measurement instruments, in particular, digital storage oscilloscopes (DSO)
We develop a digital postprocessing algorithm to compensate the frequency response in the TIADC system
The feasibility of proposed calibration algorithm has been evaluated in a two-channel TIADC system with equivalent sampling rate at 1GSPS supported by two 8 Bit-500MSPS ADCs (Ideal 8 Bit.adc) [12]
Summary
High-speed digitizing of signals plays an important part in broadband communication and electronic measurement instruments, in particular, digital storage oscilloscopes (DSO). The performance of this TIADC system is degraded by following factors: (1) the mismatching of amplitude among various channels and (2) the different phase delay of sampling circuits. These mismatches are related to frequency and are called frequency response mismatch. The frequency response mismatch will lead to additional spurious components in the spectrum and degrade the system’s signal-to-noise ratio (SNR) [1, 2]
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