0.9‐V CMOS cascode amplifier with body‐driven gain boosting

Abstract

SUMMARYThe body-driven variant of the gain-boosting technique is here exploited to design a CMOS transconductance amplifier with minimum supply below 1 V. When compared with the conventional gain-boosting technique, the proposed body-driven approach reduces the minimum supply requirement by two thresholds in a rail-to-rail amplifier exploiting two complementary input stage topologies. Simulations using a 130-nm process show that a 0.9-V power supply is adequate for a single-stage rail-to-rail amplifier providing a 56-dB gain, which is 18 dB higher than that achieved by the same architecture but using the traditional cascoding approach. The main drawbacks are that the solution requires a twin-tub process and an additional bias section.

0.8 V bulk-driven operational amplifier

“…Based in this technique the input signal is applied to the bulk terminal of the input devices featuring rail-torail input common-mode range [3,4,6,[18][19][20][21][22][23][24][25][26][27][28][29]. The main limitation of the amplifiers, which are based on the bulkdriven technique, is that the input transconductance is equal to the small bulk transconductance which is 3-5 times smaller than the gate-transconductance.…”

Constant and maximum bandwidth feedback amplifier with adaptive frequency compensation

“…It is a single-gain stage folded-cascode topology implemented by transistors M1-M11, followed by a class AB source follower. If the DC gain provided by this simple stage is not sufficient, gainboosting techniques could be exploited [10]- [11], without requiring a significant modification of the proposed approach. The class AB source follower is made up of common drain transistors M12-M15 and two bias current generators M12b and M13b.…”

0.13-µm CMOS tunable transconductor based on the body-driven gain boosting technique with application in Gm-C filters

“…In this context, a gain boosted technique that exploits the body of the auxiliary gain-boosting transistor as input terminal was discussed in [10]. Compared to the standard lowvoltage cascode approach, the body-driven one reduces the minimum supply requirement by two thresholds in a rail-to-rail structure adopting two complementary n-channel and p-channel sections [10].…”