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1887

access icon free Multistage ADC based on integrating quantiser and gated ring oscillator

© The Institution of Engineering and Technology
Received 26/10/2012, Published

Dual slope ADCs have been shown to implement noise shaping when converted into integrating quantisers, turning amplitude information into time encoded pulses. A way to increase the resolution of an integrating quantiser is to use a gated ring oscillator (GRO) to estimate the pulse length. Such combination benefits from the noise shaping effect inherent to GROs. Hence, a noise shaping order increase can be achieved by a multistage configuration when an integrating quantiser is cascaded with a GRO. The architecture and behavioural simulation of such a MASH converter is discussed. Also, the on-line calibration of the noise cancellation filters is described.

Inspec keywords: analogue-digital conversion; calibration; oscillators; filters

Other keywords: GRO; pulse length estimation; noise cancellation filters; quantiser integration; online calibration; behavioural simulation; dual slope analogue-digital converter; time encoded pulses; noise shaping order; gated ring oscillator; MASH converter; architecture simulation; multistage ADC; amplitude information

Subjects: A/D and D/A convertors; A/D and D/A convertors; Measurement standards and calibration

References

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      • 4. Rao, S., Young, B., Elshazly, A., Yin, W., Sasidhar, N., Hanumolu, P.K.: ‘A 71dB SFDR open loop VCO-based ADC using 2-level PWM modulation’. Proc. IEEE Symp. on VLSI Circuits, Honolulu, HI, USA, June 2011, pp. 270–271.
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      • 1. Prefasi, E., Pun, E., Hernandez, L., Paton, S.: ‘Second-order multi-bit ΣΔ ADC using a pulse-width modulated DAC and an integrating quantizer’. Proc. IEEE 2009 16th Int. Conf. Electronics, Circuits and Systems, Yasmine Hammamet, Tunisia, December 2009, pp. 37–40.
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      • 3. Straayer, M.Z., Perrott, M.H.: ‘A multi-path gated ring oscillator TDC with first-order noise shaping’, IEEE J. Solid-State Circuits, 2009, 44, pp. 1089–1098 (doi: 10.1109/JSSC.2009.2014709).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2012.3776
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