Name
Abstract | ||
|---|---|---|
Floating-point analog-to-digital converter (FADC) utilizes an up-front variable-gain amplifier (VGA) to enhance its low-level resolution. Although it is a single-path system, varying gain by switching circuit elements in and out modulates the gain and offset as in the multi-path time-interleaved ADC. For high-speed operation at all gain settings, a constant-bandwidth switched-capacitor VGA is implemented with variable-bandwidth opamps, and its gain and offset are digitally calibrated in background using signal-dependent pseudo-random noise (PN) dithering and chopping techniques. A three-stage VGA adjusts its gain instantly from times 1 to times 32 depending on the sampled input level, and improves the INL of a 10-bit ADC from 24 to 0.9 least significant bits (LSBs) at a 15-bit level for the low-level input. The resulting 10 ~ 15-bit 60-MS/s ADC needs no input sample-and-hold (S/H) stage, and achieves a system noise of -80 dBFS with a gain set to times32. A prototype chip in 0.18-mum CMOS occupies an active area of 3.0times2.0 mm2, and consumes 300 mW at 1.8 V including digital calibration logic. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1109/JSSC.2009.2022993 | Solid-State Circuits, IEEE Journal of |
Keywords | DocType | Volume |
analogue-digital conversion,operational amplifiers,random noise,switched capacitor networks,chopping techniques,constant-bandwidth switched-capacitor VGA,digital gain,floating-point ADC,floating-point analog-to-digital converter,multipath time-interleaved ADC,offset calibration,signal-dependent pseudo-random noise dithering,single-path system,up-front variable-gain amplifier,variable-bandwidth opamps,Background calibration,chopping,digital calibration,floating-point ADC,gain and offset calibration,pseudo-random noise (PN) dithering,self-calibration,variable- gain amplifier | Journal | 44 |
Issue | ISSN | Citations |
9 | 0018-9200 | 0 |
PageRank | References | Authors |
0.34 | 0 | 4 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yun-Shiang Shu | 1 | 139 | 17.99 |
| Wei-Ming Lee | 2 | 20 | 3.46 |
| Bang-Sup Song | 3 | 210 | 34.91 |
| Pain, B. | 4 | 0 | 0.34 |