Optimization of hybrid filter bank based ADCs by oversampling method

Hybrid Filter Bank (HFB) is a promising technology capable of enhancing the resolution and speed of analog-to-digital conversion. However, when using widely adopted analytical filters, HFB designs face the problem that the ideal synthetic filter frequency response is discontinuous over the Nyquist zone. In this letter, we adopt a simple and effective method of double oversampling to solve the discontinuity problem. The design of analytical filter based on weighted least square method (WLS) and the optimal design of synthetic filter after oversampling are presented. The simulation results show that the proposed scheme can achieve good HFB reconstruction performance, which has a significantly broaden spurious-free dynamic range (SFDR) in comparison to the that without oversampling scheme.