High slew rate and low output resistance class-AB flipped voltage follower cell with increased current driving capability

The paper proposes a class-AB flipped voltage follower (FVF) cell, in which the bulk-driven transistor is used as an input transistor with a replica-biased scheme to eliminate the DC level shift while a cascoding transistor is used to reduce the output resistance. The proposed FVF cell has several advantages such as low output resistance, approximately unity voltage gain, high symmetrical slew rate, high current sourcing capability, high current sinking capability and wide bandwidth. The proposed FVF cell has been simulated in Cadence Virtuoso Analog Design Environment using BSIM3v3 180 nm CMOS technology with a power supply voltage of 1.2 V.

[1]  R.G. Carvajal,et al.  The flipped voltage follower: a useful cell for low-voltage low-power circuit design , 2002, 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353).

[2]  Willy Sansen,et al.  analog design essentials , 2011 .

[3]  Jesús Ezequiel Molinar-Solís,et al.  Comparison of conventional and new class AB modifications of the Flipped Voltage Follower and their implementation in high performance amplifiers , 2014, 2014 IEEE 5th Latin American Symposium on Circuits and Systems.

[4]  M. A. Gurrola-Navarro,et al.  Free class-AB flipped voltage follower using bulk-driven technique , 2015 .

[5]  P. E. Allen,et al.  Body-driving as a low-voltage analog design technique for CMOS technology , 2000, 2000 Southwest Symposium on Mixed-Signal Design (Cat. No.00EX390).

[6]  Caffey Jindal,et al.  Class-AB level shifted flipped voltage follower cell using bulk-driven technique , 2017, IET Circuits Devices Syst..

[7]  Jesús Ezequiel Molinar-Solís,et al.  A CMOS Low-Voltage Super Follower Using Quasi-Floating Gate Techniques , 2018, J. Circuits Syst. Comput..

[8]  Ramón González Carvajal,et al.  New improved CMOS class AB buffers based on differential flipped voltage followers , 2006, 2006 IEEE International Symposium on Circuits and Systems.

[9]  Izzet Kale,et al.  Bulk-driven flipped voltage follower , 2009, 2009 IEEE International Symposium on Circuits and Systems.