Multistage ADC based on integrating quantiser and gated ring oscillator Articles uri icon

publication date

  • April 2013

start page

  • 526

end page

  • 527

issue

  • 8

volume

  • 49

international standard serial number (ISSN)

  • 0013-5194

electronic international standard serial number (EISSN)

  • 1350-911X

abstract

  • 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.

keywords

  • oscillators; calibration; analogue-digital conversion; filters; multistage adc; behavioural simulation; architecture simulation; time encoded pulses; noise shaping order; gated ring oscillator; online calibration; pulse length estimation; dual slope analogue-digital converter