A low noise compact class AB buffer amplifier with accurate quiescent current control

2010 ◽  
Vol 65 (2) ◽  
pp. 283-288 ◽  
Author(s):  
Jian Lv ◽  
Yun Zhou ◽  
DongLu Zhang ◽  
YaDong Jiang
Keyword(s):  
Low Noise ◽  
Current Control ◽  
Class Ab ◽  
Compact Class ◽  
Buffer Amplifier ◽  
Quiescent Current

200 μW CMOS class AB unity-gain buffers with accurate quiescent current control

2010 ◽  
Author(s):  
Antonio J. Lopez-Martin ◽  
Jose Algueta ◽  
Lucia Acosta ◽  
Ramon G. Carvajal ◽  
Jaime Ramirez-Angulo
Keyword(s):  
Current Control ◽  
Class Ab ◽  
Unity Gain ◽  
Quiescent Current

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

scholarly journals 0.5 V CMOS Inverter-Based Transconductance Amplifier with Quiescent Current Control

2021 ◽  
Vol 11 (4) ◽  
pp. 37
Author(s):  
Andrea Ballo ◽  
Salvatore Pennisi ◽  
Giuseppe Scotti
Keyword(s):  
Supply Voltage ◽  
Current Control ◽  
Cmos Inverter ◽  
Class Ab ◽  
Transconductance Amplifier ◽  
Dc Gain ◽  
Unity Gain ◽  
Quiescent Current ◽  
Bulk Technology ◽  
Inverter Topology

A two-stage CMOS transconductance amplifier based on the inverter topology, suitable for very low supply voltages and exhibiting rail-to-rail output capability is presented. The solution consists of the cascade of a noninverting and an inverting stage, both characterized by having only two complementary transistors between the supply rails. The amplifier provides class-AB operation with quiescent current control obtained through an auxiliary loop that utilizes the MOSFETs body terminals. Simulation results, referring to a commercial 28 nm bulk technology, show that the quiescent current of the amplifier can be controlled quite effectively, even adopting a supply voltage as low as 0.5 V. The designed solution consumes around 500 nA of quiescent current in typical conditions and provides a DC gain of around 51 dB, with a unity gain frequency of 1 MHz and phase margin of 70 degrees, for a parallel load of 1 pF and 1.5 MΩ. Settling time at 1% is 6.6 μs, and white noise is 125 nV/Hz.

Low-voltage class AB buffers with quiescent current control

1998 ◽  
Vol 33 (6) ◽  
pp. 915-920 ◽  
Author(s):  
Fan You ◽  
S.H.K. Embabi ◽  
E. Sanchez-Sinencio
Keyword(s):  
Low Voltage ◽  
Current Control ◽  
Class Ab ◽  
Quiescent Current

scholarly journals Implementation of Power-Efficient Class AB Miller Amplifiers Using Resistive Local Common-Mode Feedback

2021 ◽  
Vol 11 (3) ◽  
pp. 31
Author(s):  
Anindita Paul ◽  
Mario Renteria-Pinon ◽  
Jaime Ramirez-Angulo ◽  
Ricardo Bolaños-Pérez ◽  
Héctor Vázquez-Leal ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Figure Of Merit ◽  
Small Signal ◽  
Common Mode ◽  
Power Efficient ◽  
Class Ab ◽  
Op Amp ◽  
Class A ◽  
Wide Range ◽  
Quiescent Current

An approach to implement single-ended power-efficient static class-AB Miller op-amps with symmetrical and significantly enhanced slew-rate and accurately controlled output quiescent current is introduced. The proposed op-amp can drive a wide range of resistive and capacitive loads. The output positive and negative currents can be much higher than the total op-amp quiescent current. The enhanced performance is achieved by utilizing a simple low-power auxiliary amplifier with resistive local common-mode feedback that increases the quiescent power dissipation by less than 10%. The proposed class AB op-amp is characterized by significantly enhanced large-signal dynamic, static current efficiency, and small-signal figures of merits. The dynamic current efficiency is 15.6 higher, the static current efficiency is 8.9 times higher, and the small-signal figure of merit is 2.3 times higher than the conventional class-A op-amp. A global figure of merit that determines an op-amp’s ultimate speed is 6.33 times higher than the conventional class A op-amp.

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