Abstract
A fourth-order 1-bit continuous-time delta-sigma modulator designed in a 65 nm process for portable ultrasound
scanners is presented in this paper. The loop filter consists of RCintegrators, with programmable capacitor arrays and resistors, and the quantizer is implemented with a high-speed clocked comparator and a pull-down clocked latch. The feedback signal is generated with voltage DACs based on transmission gates. Using this implementation, a small and low-power solution required for portable ultrasound scanner applications is achieved. The modulator has a bandwidth of 10 MHz with an oversampling ratio of 16 leading to an operating frequency of 320 MHz. The design occupies an area of 0.0175 mm2 and achieves a SNR of 45 dB consuming 489 µA at a supply voltage of 1.2 V; the resulting FoM is 197 fJ/conversion. The results are based on simulations with extracted parasitics including process and mismatch variations.
scanners is presented in this paper. The loop filter consists of RCintegrators, with programmable capacitor arrays and resistors, and the quantizer is implemented with a high-speed clocked comparator and a pull-down clocked latch. The feedback signal is generated with voltage DACs based on transmission gates. Using this implementation, a small and low-power solution required for portable ultrasound scanner applications is achieved. The modulator has a bandwidth of 10 MHz with an oversampling ratio of 16 leading to an operating frequency of 320 MHz. The design occupies an area of 0.0175 mm2 and achieves a SNR of 45 dB consuming 489 µA at a supply voltage of 1.2 V; the resulting FoM is 197 fJ/conversion. The results are based on simulations with extracted parasitics including process and mismatch variations.
| Original language | English |
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| Title of host publication | Proceedings of 2016 IEEE NORCAS Nordic Circuits and Systems Conference - NORCAS 2016 |
| Number of pages | 5 |
| Publisher | IEEE |
| Publication date | 2016 |
| ISBN (Print) | 978-1-5090-1095-0 |
| DOIs | |
| Publication status | Published - 2016 |
| Event | 2016 IEEE NorCAS Conference - Copenhagen, Denmark Duration: 1 Nov 2016 → 2 Nov 2016 |
Conference
| Conference | 2016 IEEE NorCAS Conference |
|---|---|
| Country | Denmark |
| City | Copenhagen |
| Period | 01/11/2016 → 02/11/2016 |