Title :
Design procedures for a fully differential folded-cascode CMOS operational amplifier
Author :
Mallya, Sudhir M. ; Nevin, Joseph H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Cincinnati Univ., OH, USA
fDate :
12/1/1989 12:00:00 AM
Abstract :
A fully differential folded-cascode op. amp. is analyzed, and the results are presented in the form of design equations and procedures. Tradeoffs among such factors as bandwidth, gain, phase margin, bias currents, signal swing, slew rate, and power are made evident. Closed-form expressions are developed, and a sequence of design steps is established. A graphical representation of the relationships among the gain, power, and phase margin for different capacitive loadings is presented to illustrate visually one form of design optimization. The results of SPICE simulations are shown to agree very well with the design equations presented
Keywords :
CMOS integrated circuits; differential amplifiers; linear integrated circuits; operational amplifiers; CMOS operational amplifier; SPICE simulations; bandwidth; bias currents; capacitive loadings; design equations; design optimization; fully differential folded-cascode; gain; linear IC; monolithic type; op. amp.; phase margin; power; signal swing; slew rate; Bandwidth; Capacitance; Differential amplifiers; Differential equations; Equivalent circuits; Frequency response; Operational amplifiers; Solid state circuit design; Transconductance; Transfer functions;
Journal_Title :
Solid-State Circuits, IEEE Journal of
