Journal ArticleDOI
Gain-Boosted Super Class AB OTAs Based on Nested Local Feedback
Javier Beloso-Legarra,Carlos A. De La Cruz-Blas,Antonio J. Lopez-Martin,Jaime Ramirez-Angulo +3 more
TLDR
In this article, a new approach to design super class AB operational transconductance amplifiers (OTAs) with enhanced large-signal and small-Signal performance is presented based on employing two nested positive and negative feedback loops at the active load of an adaptively biased differential pair in weak inversion region.Abstract:
A new approach to design super class AB operational transconductance amplifiers (OTAs) with enhanced large-signal and small-signal performance is presented. It is based on employing two nested positive and negative feedback loops at the active load of an adaptively biased differential pair in weak inversion region. As a result, DC gain, gain-bandwidth product, settling time and noise are improved compared to conventional super class AB OTAs without extra circuit nodes or power consumption. Measurement results of a 180 nm CMOS test chip prototype show a current boosting factor higher than 5000 and a nearly ideal current efficiency. Due to the ultra-low quiescent currents and high driving capability, the circuit exhibits an excellent large-signal figure-of-merit (FOML) of 236 $\text{V}^{-1}$ . To illustrate the applicability of the proposed approach, a differential sample-and-hold (S/H) circuit was designed and fabricated on the same test chip. Measurement results of the S/H validate the advantages of the proposal.read more
Citations
More filters
Journal ArticleDOI
Analog CMOS Readout Channel for Time and Amplitude Measurements With Radiation Sensitivity Analysis for Gain-Boosting Amplifiers
T. Sanchez-Rodriguez,Juan Antonio Gómez-Galán,F. Marquez,Manuel Sanchez-Raya,J. Hinojo,Fernando Muñoz +5 more
TL;DR: In this paper, the authors proposed a method to select the value of the QFG capacitors, minimizing the area occupancy while maintaining robustness to radiation, and implemented a readout system using compact gain boosting techniques based on quasi-floating gate transistors achieving accurate energy measurement with good resolution.
Proceedings ArticleDOI
A Local Positive Feedback Loop-Reused Technique for Enhancing Performance of Folded Cascode Amplifier
TL;DR: In this paper , a local positive feedback loop-reused (LPFBR) technique is proposed to improve the performance of conventional LPFB OTA, which has almost 10.5 times the bandwidth and maintains stability compared to that of the conventional LP FB OTA under the condition that LCMFB resistors are increased by a factor of 10.
Proceedings ArticleDOI
Single-Stage Class-AB Non-Linear Current Mirror OTA
TL;DR: In this paper , a single-stage class-AB operational transconductance amplifier (OTA) with enhanced large and small-signal performance is presented, which is biased in weak inversion to save power and employs a nonlinear current mirror as active load, leading a boosting current directly at the output branch.
Proceedings ArticleDOI
Single-Stage Class-AB Non-Linear Current Mirror OTA
TL;DR: In this paper , a single-stage class-AB operational transconductance amplifier (OTA) with enhanced large and small-signal performance is presented, which is biased in weak inversion to save power and employs a nonlinear current mirror as active load, leading a boosting current directly at the output branch.
Journal ArticleDOI
Power-Efficient Single-Stage Class-AB OTA Based on Non-Linear Nested Current Mirrors
TL;DR: In this paper , a non-linear nested current mirror at the active load of a splitted differential input pair biased in weak inversion is proposed to boost dynamic currents beyond their quiescent value directly at the output branch.
References
More filters
Journal ArticleDOI
Circuit techniques for reducing the effects of op-amp imperfections: autozeroing, correlated double sampling, and chopper stabilization
Christian Enz,Gabor C. Temes +1 more
TL;DR: In this paper, some old and new circuit techniques are described for the compensation of the amplifier's most important nonideal effects including the noise (mainly thermal and 1/f noise), the input-referred dc offset voltage as well as the finite gain.
Journal ArticleDOI
A low-power low-noise CMOS amplifier for neural recording applications
R.R. Harrison,C.T. Charles +1 more
TL;DR: In this article, a low-noise low-power biosignal amplifiers capable of amplifying signals in the millihertz-to-kilohertz range while rejecting large dc offsets generated at the electrode-tissue interface is presented.
Book
Principles of Data Conversion System Design
TL;DR: This advanced text and reference covers the design and implementation of integrated circuits for analog-to-digital and digital-toanalog conversion and systematically leads the reader to advanced topics, describing design issues and techniques at both circuit and system level.
Journal ArticleDOI
The flipped voltage follower: a useful cell for low-voltage low-power circuit design
Ramon G. Carvajal,Jaime Ramirez-Angulo,Antonio J. Lopez-Martin,Antonio Torralba,Juan Antonio Gómez Galán,Alfonso Carlosena,Fernando Muñoz Chavero +6 more
TL;DR: A design example showing the application of the FVF to build systems based on translinear loops is described which shows the potential of this cell for the design of high-performance low-power/low-voltage analog and mixed-signal circuits.
Journal ArticleDOI
Low-Voltage Super class AB CMOS OTA cells with very high slew rate and power efficiency
TL;DR: In this paper, a simple technique to achieve lowvoltage power-efficient class AB operational transconductance amplifiers (OTAs) is presented, which is based on the combination of class AB differential input stages and local commonmode feedback (LCMFB) which provides additional dynamic current boosting, increased gain-bandwidth product (GBW), and near-optimal current efficiency.