A 10-MHz BW 77.3-dB SNDR 640-MS/s GRO-Based CT MASH ΔΣ Modulator
We present in this brief a novel multi-stage noise-shaping (MASH) 3-1 continuous-time (CT) delta-sigma modulator ( $\Delta \Sigma \text{M}$ ) with gated ring oscillator based quantizers (GROQs) in both stages of the cascade. The use of GROQs increases the linearity performance with respect to the co...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/340749 |
| Acceso en línea: | http://hdl.handle.net/10261/340749 https://api.elsevier.com/content/abstract/scopus_id/85091852364 |
| Access Level: | acceso abierto |
| Palabra clave: | ΔΣ modulators Analog-to-digital converters Continuous-time circuits Time/frequency-based quantization |
| Sumario: | We present in this brief a novel multi-stage noise-shaping (MASH) 3-1 continuous-time (CT) delta-sigma modulator ( $\Delta \Sigma \text{M}$ ) with gated ring oscillator based quantizers (GROQs) in both stages of the cascade. The use of GROQs increases the linearity performance with respect to the conventional voltage controlled oscillator based quantizers (VCOQs) and allows a more robust extraction of the front-end stage quantization error in the time domain, thus making the proposed architecture more suitable to implement high-order expandable scaling-friendly MASH $\Delta \Sigma $ Ms, in which the back-end stages are implemented by mostly-digital GRO-based time-to-digital converters (TDCs). The circuit has been fabricated in a 65-nm CMOS technology with 1-V supply voltage, and it operates at 640-MHz sampling frequency to digitize 10-MHz signals. To the best of the authors' knowledge, this is the first reported experimental validation of a GRO-based CT MASH $\Delta \Sigma \text{M}$ , featuring a 79.8-dB signal to noise ratio (SNR) at -2.2-dBFS, a 77.3-dB signal to (noise + distortion) ratio (SNDR) at -4-dBFS and a dynamic range (DR) of 81.7 dB, with a power consumption of 12-mW. These metrics demonstrate state-of-the-art performance with a DR-based Schreier FOM of 170.9 dB. |
|---|