Rail-to-rail constant-g m input stage and class AB output stage for low-voltage CMOS op amps

1994 ◽  
Vol 6 (2) ◽  
pp. 121-133 ◽  
Author(s):  
Jacob H. Botma ◽  
Remco J. Wiegerink ◽  
Sander L. J. Gierkink ◽  
Roelof F. Wassenaar
Keyword(s):  
Low Voltage ◽  
Output Stage ◽  
Input Stage ◽  
Class Ab ◽  
Op Amps ◽  
Rail To Rail

scholarly journals A 0.3 V Rail-to-Rail Ultra-Low-Power OTA with Improved Bandwidth and Slew Rate

2021 ◽  
Vol 11 (2) ◽  
pp. 19
Author(s):  
Francesco Centurelli ◽  
Riccardo Della Sala ◽  
Pietro Monsurrò ◽  
Giuseppe Scotti ◽  
Alessandro Trifiletti
Keyword(s):  
Low Power ◽  
Low Voltage ◽  
Supply Voltage ◽  
Cmos Process ◽  
Slew Rate ◽  
Large Signal ◽  
Output Stage ◽  
Ultra Low Power ◽  
Input Stage ◽  
Rail To Rail

In this paper, we present a novel operational transconductance amplifier (OTA) topology based on a dual-path body-driven input stage that exploits a body-driven current mirror-active load and targets ultra-low-power (ULP) and ultra-low-voltage (ULV) applications, such as IoT or biomedical devices. The proposed OTA exhibits only one high-impedance node, and can therefore be compensated at the output stage, thus not requiring Miller compensation. The input stage ensures rail-to-rail input common-mode range, whereas the gate-driven output stage ensures both a high open-loop gain and an enhanced slew rate. The proposed amplifier was designed in an STMicroelectronics 130 nm CMOS process with a nominal supply voltage of only 0.3 V, and it achieved very good values for both the small-signal and large-signal Figures of Merit. Extensive PVT (process, supply voltage, and temperature) and mismatch simulations are reported to prove the robustness of the proposed amplifier.

Class AB output stage for low voltage CMOS op-amps with accurate quiescent current control

2000 ◽  
Vol 36 (21) ◽  
pp. 1753 ◽  
Author(s):  
A. Torralba ◽  
R.G. Carvajal ◽  
J. Martinez-Heredia ◽  
J. Ramírez-Angulo
Keyword(s):  
Low Voltage ◽  
Current Control ◽  
Output Stage ◽  
Class Ab ◽  
Op Amps ◽  
Quiescent Current
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