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Fully-VCO-based 0-2 MASH CT ΔΣ ADC

Fully-VCO-based 0-2 MASH CT ΔΣ ADC

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A fully-voltage-controlled oscillator (VCO)-based continuous-time (CT) Delta-Sigma (ΔΣ) analogue-to-digital converter (ADC) is reported, implementing second-order noise shaping without any analogue integrators. Traditional power-hungry front-end analogue integrator is replaced by a highly-digital power-efficient VCO-based integrator, which is constructed by a VCO, a phase detector and a charge pump. The quantisation is executed by a VCO-based quantiser with intrinsic noise shaping. Taking advantage of the mostly-digital and high-order structure, a spurious-free dynamic range of 74 dB and a figure-of-merit of 52 fJ/step over a 40 MHz bandwidth are achieved by a 0-2 multi-stage shaping (MASH) demonstration in 40 nm CMOS.

References

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      • 2. Reddy, K., Rao, S., Inti, R., et al: ‘A 16 mW 78 dB-SNDR 10 MHz-BW CT-ΔΣ ADC using residue-cancelling VCO-based quantizer’. ISSCC Dig. Tech. Papers, February 2012, pp. 152153.
    3. 3)
      • 3. Yoon, Y., Lee, K., Wang, P., et al: ‘A purely-VCO-based single-loop high-order continuous-time ΣΔ ADC’. Proc. IEEE Int. Symp. on Circuits and Systems (ISCAS), Melbourne VIC, Australia, June 2014, pp. 926929.
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