An overview of feed-forward design techniques for high-gain wideband operational transconductance amplifiers

2006 ◽  
Vol 37 (9) ◽  
pp. 1018-1029 ◽  
Author(s):  
Bharath Kumar Thandri ◽  
Jose Silva-Martinez
Keyword(s):  
High Gain ◽  
Feed Forward ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers ◽  
Design Techniques

scholarly journals Recent Advances on the Design of High-Gain Wideband Operational Transconductance Amplifiers

VLSI Design ◽  
2009 ◽  
Vol 2009 ◽  
pp. 1-11 ◽  
Author(s):  
Rida Assaad ◽  
Jose Silva-Martinez
Keyword(s):  
High Frequency ◽  
High Gain ◽  
Feed Forward ◽  
Operational Transconductance Amplifiers ◽  
Miller Compensation ◽  
Multistage Amplifiers ◽  
Dc Gain ◽  
Folded Cascode ◽  
Transconductance Amplifiers ◽  
Better Than

Feed-forward techniques are explored for the design of high-frequency Operational Transconductance Amplifiers (OTAs). For single-stage amplifiers, a recycling folded-cascode OTA presents twice the GBW (197.2 MHz versus 106.3 MHz) and more than twice the slew rate (231.1 V/s versus 99.3 V/s) as a conventional folded cascode OTA for the same load, power consumption, and transistor dimensions. It is demonstrated that the efficiency of the recycling folded-cascode is equivalent to that of a telescopic OTA. As for multistage amplifiers, a No-Capacitor Feed-Forward (NCFF) compensation scheme which uses a high-frequency pole-zero doublet to obtain greater than 90 dB DC gain, GBW of 325 MHz and better than phase margin is discussed. The settling-time- of the NCFF topology can be faster than that of OTAs with Miller compensation. Experimental results for the recycling folded-cascode OTA fabricated in TSMC 0.18 m CMOS, and results of the NCFF demonstrate the efficiency and feasibility of the feed-forward schemes.

High-Gain Operational Transconductance Amplifiers in a Printed Complementary Organic TFT Technology on Flexible Foil

2013 ◽  
Vol 60 (12) ◽  
pp. 3117-3125 ◽  
Author(s):  
Giorgio Maiellaro ◽  
Egidio Ragonese ◽  
Alessandro Castorina ◽  
Stephanie Jacob ◽  
Mohammed Benwadih ◽  
...  
Keyword(s):  
High Gain ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers
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