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A hybrid two-point modulator which mitigates the nonlinearity problem of a digitally controlled oscillator (DCO) and provides a fine delay mismatch calibration is proposed for high data rate applications. A DCO with a separate high-pass modulation path in which only 3 b are used for a capacitor array is designed for flexible gain partition and simple nonlinearity calibration. A nonuniform multilevel...
This paper describes an effective way of relaxing the nonlinearity problem of the digitally-controlled oscillator (DCO) in the two-point modulator design. A separate coarse varactor array dedicated for the high-pass modulation significantly simplifies the nonlinearity calibration of the DCO with a few-bit control. In addition, a finite-impulse response (FIR) filter is designed for the multi-bit high-pass...
An improved image fusion method is proposed in this paper. Firstly, the source image was decomposed into the low-pass and directional band-pass coefficients by nonsubsampled contourlet transform (NSCT) for multi-sensor image fusion of the same scene. The low-pass part uses the fusion method of improved the energy contrast, it fully takes into account the energy contrast of coefficient as well as the...
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