### Abstract

Original language | English |
---|---|

Journal | Analog Integrated Circuits and Signal Processing |

Volume | 92 |

Issue number | 3 |

Pages (from-to) | 393-402 |

Number of pages | 10 |

ISSN | 0925-1030 |

DOIs | |

Publication status | Published - 2017 |

### Keywords

- Ultrasound
- Portable
- Scanners
- Integrated
- Continuous-Time
- Delta-Sigma
- ADC

### Cite this

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**A Continuous-Time Delta-Sigma ADC for Portable Ultrasound Scanners.** / Llimos Muntal, Pere; Jørgensen, Ivan Harald Holger; Bruun, Erik.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - A Continuous-Time Delta-Sigma ADC for Portable Ultrasound Scanners

AU - Llimos Muntal, Pere

AU - Jørgensen, Ivan Harald Holger

AU - Bruun, Erik

PY - 2017

Y1 - 2017

N2 - A fully diﬀerential fourth-order 1-bit continuous-time delta-sigma ADC designed in a 65nm process for portable ultrasound scanners is presented in this paper. The circuit design, implementation and measurements on the fabricated die are shown. The loop ﬁlter consists of RC-integrators, programmable capacitor arrays, resistors and voltage feedback DACs. The quantizer contains a pulse generator, a high-speed clocked comparator and a pull-down clocked latch to ensure constant delay in the feedback loop. Using this implementation, a small and low-power solution required for portable ultrasound scanner applications is achieved. The converter has a supply voltage of 1.2V, a bandwidth of 10MHz and an oversampling ratio of 16 leading to an operating frequency of 320MHz. The design occupies a die area of 0.0175mm2. Simulations with extracted parasitics show a SNR of 45.2dB and a current consumption of 489 µA. However, by adding a model of the measurement setup used, the performance degrades to 42.1dB. The measured SNR and current consumption are 41.6dB and 495 µA, which closely ﬁt with the expected simulations. Several dies have been measured, and an estimation of the die spread distribution is given.

AB - A fully diﬀerential fourth-order 1-bit continuous-time delta-sigma ADC designed in a 65nm process for portable ultrasound scanners is presented in this paper. The circuit design, implementation and measurements on the fabricated die are shown. The loop ﬁlter consists of RC-integrators, programmable capacitor arrays, resistors and voltage feedback DACs. The quantizer contains a pulse generator, a high-speed clocked comparator and a pull-down clocked latch to ensure constant delay in the feedback loop. Using this implementation, a small and low-power solution required for portable ultrasound scanner applications is achieved. The converter has a supply voltage of 1.2V, a bandwidth of 10MHz and an oversampling ratio of 16 leading to an operating frequency of 320MHz. The design occupies a die area of 0.0175mm2. Simulations with extracted parasitics show a SNR of 45.2dB and a current consumption of 489 µA. However, by adding a model of the measurement setup used, the performance degrades to 42.1dB. The measured SNR and current consumption are 41.6dB and 495 µA, which closely ﬁt with the expected simulations. Several dies have been measured, and an estimation of the die spread distribution is given.

KW - Ultrasound

KW - Portable

KW - Scanners

KW - Integrated

KW - Continuous-Time

KW - Delta-Sigma

KW - ADC

U2 - 10.1007/s10470-017-1004-5

DO - 10.1007/s10470-017-1004-5

M3 - Journal article

VL - 92

SP - 393

EP - 402

JO - Analog Integrated Circuits and Signal Processing

JF - Analog Integrated Circuits and Signal Processing

SN - 0925-1030

IS - 3

ER -