An enhanced fully differential Recyclic Folded Cascode OTA

2012 ◽  
Author(s):  
Pravanjan Patra ◽  
S. Kumaravel ◽  
B. Venkatramani
Keyword(s):  
Fully Differential ◽  
Folded Cascode

scholarly journals A novel fully-differential class AB folded-cascode OTA

2004 ◽  
Vol 1 (13) ◽  
pp. 358-362 ◽  
Author(s):  
Mohammad Yavari ◽  
Omid Shoaei
Keyword(s):  
Class Ab ◽  
Fully Differential ◽  
Folded Cascode

scholarly journals A Start-up Assisted Fully Differential Folded Cascode Opamp

2019 ◽  
Vol 28 (10) ◽  
pp. 1950164 ◽  
Author(s):  
R. Nagulapalli ◽  
K. Hayatleh ◽  
S. Barker ◽  
B. Yassine ◽  
S. Zourob ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Positive Feedback ◽  
Cmos Technology ◽  
Gain Bandwidth ◽  
Fully Differential ◽  
Start Up ◽  
Unity Gain ◽  
Folded Cascode ◽  
Current Selection ◽  
Latch Up

This paper explains the hidden positive feedback in a two-stage fully differential amplifier through external feedback resistors and possible DC latch-up during the amplifier start-up. The biasing current selection among the cascade branches has been explained intuitively, with reference to previous literature. To avoid the latch-up problem, irrespective of the transistor bias currents, a novel hysteresis-based start-up circuit is proposed. An 87[Formula: see text]dB, 250[Formula: see text]MHz unity gain bandwidth amplifier has been developed in 65[Formula: see text]nm CMOS Technology and post-layout simulations demonstrate no start-up failures out of 1000 Monte-Carlo (6-Sigma) simulations. The circuit draws 126[Formula: see text][Formula: see text]A from a 1.2[Formula: see text]V supply and occupies the 2184[Formula: see text][Formula: see text]m2 area.

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