Abstract
A low-power charge pump- and VCO-based delta-sigma ADC is presented, realising second-order noise shaping without any analogue integrator. The proposed synchronous pulse-width modulator -driven charge pump replaces an analogue integrator in delta-sigma ADC power efficiently. Together with the noise shaping provided by the VCO in the quantiser, an analogue-less 2nd-order delta-sigma ADC is obtained. The simulation results in 90 nm CMOS show that the proposed charge pump- and VCO-based delta-sigma ADC achieves 78.7 dB signal-to-noise ratio and 74.2 dB signal-to-noise and distortion ratio for a bandwidth of 2 MHz, consuming 2.95 mW, corresponding to a FoM of 0.18 pJ/conv.
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