Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Design of 18-Bit Resolution CT Delta-Sigma ADCs Using Single-Ended DAC with Mixed-Signal Calibration and OTA With Optimized Transconductance to Drain Current Ratio. |
| Συγγραφείς: |
Shailaja, J., Ravindran, Ernest |
| Πηγή: |
Circuits, Systems & Signal Processing; Jul2026, Vol. 45 Issue 7, p5163-5190, 28p |
| Θεματικοί όροι: |
Delta-sigma modulation, Digital-to-analog converters, Analog-to-digital converters, Comparator circuits, Simulation Program with Integrated Circuit Emphasis, Signal-to-noise ratio, Calibration |
| Περίληψη: |
This study proposes a new continuous-time delta-sigma modulator (CT∆ΣM) that uses an operational transconductance amplifier (OTA) with an optimized transconductance and a single-ended digital-to-analog converter (DAC) with mixed-signal calibration (MSC) to drain current ratio. The CT∆ΣM comprises loop filters, successive-approximation register (SAR) quantizer, and DAC modules. An effective OTA-based input integrator is necessary since the loop filter has been used as a cascade of integrators. Further, the transconductance is used for executing the CNTFET based OTA to measure the drain current ratio. The CT∆ΣM uses a virtual-ground-switched resistive DAC at the feedback path to minimize power and distortion. An identification of a single-ended DAC equivalent has been made in order to improve the analysis. The Component mismatches and nonlinearities introduced by DAC units are reduced using a mixed-signal calibration scheme. In addition, the proposed CT∆ΣM reduces the feedback loop by using successive-approximation register analog to digital converter (SAR ADC) quantizer. After that, a new CNTFET comparator with a robust arm structure is used to balance speed and power consumption. The Cadence Virtuoso tool is used to simulate the proposed model and the performance metrics are evaluated to determine the model's ability to reduce the current ratio. Thus, the proposed model achieves a higher signal-to-noise ratio (SNR), signal-to-noise and distortion ratio (SNDR), etc., and the obtained results outperform the performance of the current models. [ABSTRACT FROM AUTHOR] |
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| Βάση Δεδομένων: |
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