A CMOS Low-Voltage Super Follower Using Quasi-Floating Gate Techniques

Abstract

A quasi-floating gate (QFG) “super-follower” is presented. The high resistance used by the QFG transistor is constructed by two diodes connected back-to-back, leading to a simple-, temperature-stable- and small-area solution. Expressions for the behavior of the follower are introduced and verified by circuit simulations in LTSPICE using 0.5[Formula: see text][Formula: see text]m CMOS process models, which show an improved performance of the proposed circuit with respect to the original super-follower. To prove the principle, a test cell was fabricated in the same 0.5[Formula: see text][Formula: see text]m CMOS technology and characterized. Measurement results show a gain-bandwidth product of 10[Formula: see text]MHz and power consumption of 120[Formula: see text][Formula: see text]W with a 1.5[Formula: see text]V single supply.

Design of current controlled instrumental amplifier by using complementary metallic oxide semiconductor technology

“…Currently the second generation vector current (CCII) is becoming popular because it can be used to obtain good electronic tuning and very wide operating frequency in the most applications in high frequency analog signals [8]. CCII can be used as main parameter of servomotors, oscillators and other current mode applications [9].…”