In this paper, a basic cell for low-power and/or low-voltage operation is identified. It evidenced how different versions of cell, coined as "flipped voltage follower (FVF)" have been used in the past many applications. A detailed classification topologies derived from FVF given. addition, comprehensive list recently proposed low-voltage/low-power CMOS circuits based on Although paper has tutorial taste, some new applications are also presented and supported by set simulated experimental...

A simple technique to achieve low-voltage power-efficient class AB operational transconductance amplifiers (OTAs) is presented. It based on the combination of differential input stages and local common-mode feedback (LCMFB) which provides additional dynamic current boosting, increased gain-bandwidth product (GBW), near-optimal efficiency. LCMFB applied various stages, leading different OTA topologies. Three realizations this have been fabricated in a 0.5-/spl mu/m CMOS technology. For an...

A novel design principle for very low-voltage analog signal processing in CMOS technologies is presented. It based on the use of quasi-floating gate (QFG) MOS transistors. Similar to multiple input floating (MIFG) transistors, a weighted averaging inputs accurately controlled by capacitance ratios can be obtained, which basic operating principle. Nevertheless, issues often encountered MIFG structures, such as initial charge trapped gates or gain-bandwidth product degradation, are not present...

A simple high-performance architecture for bulk-driven operational transconductance amplifiers (OTAs) is presented. The solution, suitable operation under sub 1-V single supply, made up of three gain stages and, as an additional feature, provides inherent class-AB behavior with accurate and robust standby current control. OTA fabricated in a 180-nm standard CMOS technology, occupies area $19.8\cdot 10^{-3}\ \text{mm}^{2}$ powered from 0.7 V consumption around 36 $\mu\text{A}$. DC unity...

A super class-AB version of the recycling folded cascode (RFC) operational transconductance amplifier (OTA) is proposed. The use an adaptive bias circuit for input differential pair provides dynamic current boosting and increased gain-bandwidth product (GBW). Moreover, local common-mode feedback (LCMFB) at load further improves these performance parameters high efficiency. Measurement results a test chip prototype fabricated in 0.5-μm CMOS process show increase slew rate GBW by factor 34 3,...

In this paper a new basic cell for low-power and/or low-voltage operation is identified. It shown that different versions of cell, called "flipped voltage follower", have been used in the past applications. New circuits using are also proposed here.

A simple and efficient low-voltage two-stage operational amplifier with Class-AB output stage is introduced. It has a large effective current boosting factor (/spl sim/50) close to 2 bandwidth enhancement. This achieved at the expense of minimum increase in circuit complexity no additional static power dissipation. Experimental verification characteristics proposed provided.

This paper presents a scheme for the efficient implementation of low supply voltage continuous-time high-performance CMOS current mirror with input and output requirements. circuit combines shunt feedback regulated cascode stage to achieve resistance very high resistance. It can be used as high-precision in analog mixed signal circuits power close transistor's threshold voltage. The proposed has been simulated bandwidth 40 MHz obtained. An experimental chip prototype sent fabrication...

A new family of single-stage super Class-AB operational transconductance amplifiers (OTAs) suitable for low-voltage operation and low power consumption is presented. Three novel topologies are proposed featuring simplicity compactness. They based on the combination adaptive biasing techniques differential input stage nonlinear current mirrors active load that provide additional dynamic boosting. The OTAs have been fabricated in a standard 0.5-mum CMOS process. Experimental results show...

Floating-gate and quasi-floating gate MOS transistors can be efficiently employed to design CMOS transconductors. These allow achievement of relevant features in a compact simple way, such as rail-to-rail input range, continuous transconductance tuning, class AB operation. This paper illustrates how these techniques applied by employing them the two transconductors, which have been fabricated 0.5 μm process. Measurement results confirm advantages proposed approach.

An enhanced single-stage folded cascode operational transconductance amplifier able to drive large capacitive loads is presented. Circuits that adaptively bias the input differential pair and current folding stage are employed, which provide class AB operation with dynamic boosting increased gain-bandwidth (GBW) product. Measurement results of a test chip prototype fabricated in 0.5-μm CMOS process show an increase slew rate GBW by factor 30 15, respectively, versus A version using same...

A new family of very low-voltage analog circuits is introduced. These do not show the GB degradation that characterizes other approaches based on floating-gate transistors. The proposed approach validated with experimental results a CMOS mixer in 0.5-/spl mu/m technology 0.7-V input signal swing operates single 0.8-V supply transistor threshold voltages 0.67 V.

A new operational transconductance amplifier and capacitor based sinusoidal voltage controlled oscillator is presented. The transconductor uses two cross-coupled class-AB pseudo-differential pairs biased by a flipped follower, it exhibits wide range with low power consumption high linearity. has been fabricated in standard 0.8-/spl mu/m CMOS process. Experimental results show frequency tuning from 1 to 25 MHz. amplitude the nonlinear characteristic. circuit operated at 2-V supply only 1.58...

A comprehensive analysis of tunable transconductor topologies based on passive resistors is presented. Based this analysis, a new CMOS designed, which features high linearity, simplicity, and robustness against geometric parametric mismatches. novel tuning technique using just MOS transistor in the triode region allows adjustment transconductance wide range without affecting voltage-to-current conversion core. Measurement results fabricated 0.5- mum technology confirm linearity predicted. As...

In this paper, a highly power-efficient class-AB–AB Miller op-amp is discussed. The structure uses <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$g_{m}$ </tex-math></inline-formula> enhancement based on local common-mode feedback to provide class-AB operation with enhanced effective , open-loop gain, unity-gain frequency, and slew rate ( notation="LaTeX">$SR$ ) without significant increase in quiescent...

The widespread electrification of public transportation is increasing and a powerful way to reduce greenhouse gas (GHG) emissions. Using real-world driving data crucial for vehicle design efficient fleet operation. Although electric powertrains are significantly superior conventional combustion engines in many aspects, such as efficiency, dynamics, noise or pollution maintenance, there several factors that still hinder the penetration e-mobility. One most critical points high...

A scheme for low-voltage CMOS op-amp operation with rail-to-rail input and output signal swing constant g/sub m/ is presented. Single-ended fully differential versions are discussed. The based on the use of multiple-input floating-gate transistors allows direct implementation linear weighted addition continuous-time signals. Simulations presented that verify operating a 1.2-V single supply, solving, 5-MHz gain-bandwidth product, 192-/spl mu/W power dissipation 50-pF load 300/spl times/300...

A systematic comparison of flipped voltage followers circuits is presented. Two new versions the follower are introduced. They characterized by very low output impedance, high bandwidth speed, wide signal swing. All structures can be easily modified for class AB operation. Simulation results show that newly introduced have optimal characteristics

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A technique to achieve highly linear scaling of differential currents in CMOS technology is presented. It based on operation weak or moderate inversion, and features performance improvements over previous proposals aimed the same goal, like reduced supply voltage requirements, increased power efficiency, avoidance bulk effect. As an example, this applied attain continuous tuning for two novel...

A tunable CMOS Gm-C channel-select low-pass filter is presented. Class AB operation overcomes the dynamic range versus static power tradeoff of conventional topologies. Programmable transconductors are designed using quasi-floating gate transistors, which provide class without requiring extra supply voltage or requirements and keeping accurately set quiescent currents. The can be applied to channel selection in highly integrated, low zero-IF wireless receivers. For example, its frequency...

A simple modification of the MOS voltage follower is introduced that provides it with efficient class-AB operation. The modified circuit has dynamic output currents and bandwidth are essentially larger than conventional follower. This achieved same static power dissipation, very small additional complexity lower distortion. Experimental verification all these characteristics provided.

A family of tunable MOS resistors based on quasi-floating-gate (QFG) transistors biased in the triode region is analyzed this paper. From study results, a new device that outperforms previous implementations, presented. By means capacitive divider, ac component drain-to-source voltage scaled with factor alpha les 1 added to gate-to-source leading cancellation nonlinear terms. The effect resistor linearity analytically studied. Simulation results are also provided for different technologies....

SUMMARY A class AB version of the conventional super source follower (SSF) is described. The circuit greatly increases slew rate (SR) and current efficiency, maintaining low distortion output resistance SSF. Class operation achieved without extra power dissipation or supply requirements, bandwidth noise degradation. can advantageously replace SSF in a wide variety analog systems, opening new research line design. To illustrate widespread application this cell, differential unity‐gain buffer,...

This paper presents a system with location functionalities for the inventory of traffic signs based on passive RFID technology. The proposed simplifies current video-based techniques, whose requirements regarding visibility are difficult to meet in some scenarios, such as dense urban areas. In addition, can be easily extended consider any other street facilities, dumpsters or lights. Furthermore, perform process at night and vehicle’s usual speed, thus avoiding interfering normal flow road....