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Conventional ring amplifier suffers from stability problem, the problem is exacerbated when process, voltage and temperature (PVT) variations are taken into considerations. Prior works are mainly focused on stability problem, the influence of PVT on transient response were barely discussed. In this paper the influence of process variations on stability and transient response is analyzed, a process-...
A 400-MS/s 8-b SAR ADC with 2-b/cycle conversion is presented in this paper. Compared with conventional SAR structure, an AUX-DAC is proposed to achieve high switch energy efficiency and low power. The proposed structure of ADC uses a shared interpolator, which not only reduces one DAC, but also separates the input signal from the comparator to reduce the kickback noise. To further increase the speed,...
A 5.4 GHz multiple-pass ring voltage controlled oscillator (VCO) based phase-locked loop (PLL) is described. For the sake of active devices' sensitivity to process and temperature regarding ring oscillators, an effective automatic frequency calibration scheme is proposed. A new process-independent differential to single (DTOS) is used to adjust control voltage range and loop gain. The chip is implemented...
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