Back to Search
Start Over
Inverter-Based Subthreshold Amplifier Techniques and Their Application in 0.3-V ΔΣ -Modulators
- Source :
- IEEE journal of solid-state circuits, 54(5):8610131, 1436-1445. IEEE
- Publication Year :
- 2019
-
Abstract
- Subthreshold amplifiers suffer from the limited voltage headroom which leaves little space for conventional analog techniques to enhance performance and efficiency. This paper presents an evolution process of implementing conventional structures with inverters, allowing ultralow-voltage operation with increased flexibility in adopting traditional circuit techniques. Based on the proposed inverter-based elementary structure and CMFB, both the Miller-compensated (MC) operational transconductance amplifier (OTA) and the feedforward-compensated (FFC) OTA achieve significantly improved performance as compared to previous works. The proposed amplifier techniques are verified in $\Delta \Sigma $ modulator (DSM) design, with MC-OTA for a DT-DSM and FFC-OTA for a CT-DSM, both fabricated in a 0.13- $\mu \text{m}$ CMOS. The 0.3-V DT-DSM achieves 74.1-dB SNDR, 83.4-dB SFDR and 20-kHz bandwidth with 79.3- $\mu \text{W}$ power, resulting in a Schreier figure of merit (FoM) of 158 dB. The 0.3-V CT-DSM achieves 68.5-dB SNDR, 82.6-dB SFDR, and 50-kHz bandwidth with 26.3- $\mu \text{W}$ power, leading to a Schreier FoM of 161 dB. Both DSMs exhibit highly competitive performance among sub-0.5-V designs, validating the proposed subthreshold amplifier techniques.
- Subjects :
- Physics
Spurious-free dynamic range
Subthreshold conduction
Transconductance
Amplifier
020208 electrical & electronic engineering
Frequency compensation
02 engineering and technology
Delta-sigma modulation
Topology
n/a OA procedure
Amplifiers
delta-sigma modulators
subthreshold
inverter-based
CMOS
Operational transconductance amplifier
feedforward
0202 electrical engineering, electronic engineering, information engineering
OTA
Electrical and Electronic Engineering
ultralow voltage
frequency compensation
Subjects
Details
- Language :
- English
- ISSN :
- 00189200
- Database :
- OpenAIRE
- Journal :
- IEEE journal of solid-state circuits, 54(5):8610131, 1436-1445. IEEE
- Accession number :
- edsair.doi.dedup.....e80597cee36490c9623a888c03294d26