scholarly journals Compact Continuous Time Common-Mode Feedback Circuit for Low-Power, Area-Constrained Neural Recording Amplifiers

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 145
Author(s):  
Joon Young Kwak ◽  
Sung-Yun Park
Keyword(s):  
Low Power ◽  
Continuous Time ◽  
Cmos Technology ◽  
Neural Recording ◽  
Low Noise ◽  
Common Mode ◽  
Passive Components ◽  
Fully Differential ◽  
Transconductance Amplifier ◽  
Differential Difference Amplifier

A continuous-time common-mode feedback (CMFB) circuit for low-power, area-constrained neural recording amplifiers is proposed. The proposed CMFB circuit is compact; it can be realized by simply replacing passive components with transistors in a low-noise folded cascode operational transconductance amplifier (FC-OTA) that is one of the most widely adopted OTAs for neural recording amplifiers. The proposed CMFB also consumes no additional power, i.e., no separate CMFB amplifier is required, thus, it fits well to low-power, area-constrained multichannel neural recording amplifiers. The proposed CMFB is analyzed in the implementation of a fully differential AC-coupled neural recording amplifier and compared with that of an identical neural recording amplifier using a conventional differential difference amplifier-based CMFB in 0.18 μm CMOS technology post-layout simulations. The AC-coupled neural recording amplifier with the proposed CMFB occupies ~37% less area and consumes ~11% smaller power, providing 2.67× larger output common mode (CM) range without CM bandwidth sacrifice in the comparison.

A Low-Noise Biopotential CMOS Amplifier IC Using Low-Power Two-Stage OTA for Neural Recording Applications

2018 ◽  
Vol 27 (05) ◽  
pp. 1850068 ◽  
Author(s):  
Hyung Seok Kim ◽  
Hyouk-Kyu Cha
Keyword(s):  
Low Power ◽  
Integrated Circuit ◽  
Cmos Technology ◽  
Neural Recording ◽  
Open Loop ◽  
Low Noise ◽  
Two Stage ◽  
Prosthetic Devices ◽  
Transconductance Amplifier ◽  
Cmos Amplifier

This work presents a low-power biopotential amplifier integrated circuit (IC) for implantable neural recording prosthetic devices which have been implemented using 0.18-[Formula: see text]m CMOS technology. The proposed neural recording amplifier is based on a capacitive-feedback architecture and utilizes a low-power two-stage source-degenerated operational transconductance amplifier (OTA) with a modified current buffer compensation for large open-loop gain, low-noise and wide bandwidth. The designed amplifier achieves a measured gain of 39.2[Formula: see text]dB with a bandwidth between 0.25[Formula: see text]Hz to 28[Formula: see text]kHz, integrated input referred noise of 5.79[Formula: see text][Formula: see text]Vrms and noise efficiency factor of 3.16. The IC consumes 2.4[Formula: see text][Formula: see text]W at 1.2[Formula: see text]V supply and the die area is 0.09[Formula: see text]mm2.

scholarly journals A 60 GHz fully differential LNA in 90 nm CMOS technology

2013 ◽  
Vol 6 (2) ◽  
pp. 109-113 ◽  
Author(s):  
Andrea Malignaggi ◽  
Amin Hamidian ◽  
Georg Boeck
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Transmission Lines ◽  
Noise Figure ◽  
Design Procedure ◽  
Cmos Technology ◽  
High Gain ◽  
Low Noise ◽  
60 Ghz ◽  
Fully Differential

The present paper presents a fully differential 60 GHz four stages low-noise amplifier for wireless applications. The amplifier has been optimized for low-noise, high-gain, and low-power consumption, and implemented in a 90 nm low-power CMOS technology. Matching and common-mode rejection networks have been realized using shielded coplanar transmission lines. The amplifier achieves a peak small-signal gain of 21.3 dB and an average noise figure of 5.4 dB along with power consumption of 30 mW and occupying only 0.38 mm2pads included. The detailed design procedure and the achieved measurement results are presented in this work.

Common Mode Feedback Circuits for Low Voltage Fully-Differential Amplifiers

2016 ◽  
Vol 25 (10) ◽  
pp. 1650124 ◽  
Author(s):  
S. Rekha ◽  
T. Laxminidhi
Keyword(s):  
Power Supply ◽  
Continuous Time ◽  
Efficient Solution ◽  
Low Voltage ◽  
Cmos Technology ◽  
Common Mode ◽  
Power Efficient ◽  
Differential Amplifiers ◽  
Fully Differential ◽  
Simulation Results

Continuous time common mode feedback (CMFB) circuits for low voltage, low power applications are proposed. Four circuits are proposed for gate/bulk-driven pseudo-differential transconductors operating on sub-1-V power supply. The circuits are validated for a bulk-driven pseudo-differential transconductor operating on 0.5[Formula: see text]V in 0.18[Formula: see text][Formula: see text]m standard CMOS technology. Simulation results reveal that the proposed CMFB circuits offer power efficient solution for setting the output common mode of the transconductors. They also load the transconductor capacitively offering capacitance of about 1[Formula: see text]fF to tens of femto farads.

Fully Differential Difference Amplifier for Low-Noise and Low-Distortion Applications

2015 ◽  
Vol 25 (03) ◽  
pp. 1640019 ◽  
Author(s):  
Daniel Arbet ◽  
Gabriel Nagy ◽  
Martin Kováč ◽  
Viera Stopjaková
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Cmos Technology ◽  
Low Noise ◽  
Noise Performance ◽  
Micro Electro Mechanical Systems ◽  
Differential Signal ◽  
Fully Differential ◽  
Differential Difference Amplifier ◽  
High Dynamic

In this paper, a fully differential difference amplifier (FDDA) designed in 0.35[Formula: see text][Formula: see text]m CMOS technology is presented. The proposed amplifier reaches high dynamic range (DR) and low input referred noise. Comparison of noise performance of the proposed FDDA to an ordinary differential amplifier has been performed. Achieved results prove that the developed amplifier circuit can be advantageously used in applications that require a fully differential signal. Then, simulation results have been verified by the measurement of prototyped chips. In our work, the proposed amplifier was experimentally employed in the analog frontend of the readout interface (RI) for a Micro-Electro-Mechanical-Systems (MEMS) capacitive microphone.

A FAST AND LOW SETTLING ERROR CONTINUOUS-TIME COMMON-MODE FEEDBACK CIRCUIT BASED ON DIFFERENTIAL DIFFERENCE AMPLIFIER

2014 ◽  
Vol 23 (05) ◽  
pp. 1450065 ◽  
Author(s):  
TOHID MORADI KHANESHAN ◽  
SAEED NAGHAVI ◽  
MOJDE NEMATZADE ◽  
KHAYROLLAH HADIDI ◽  
ADIB ABRISHAMIFAR ◽  
...  
Keyword(s):  
Continuous Time ◽  
High Speed ◽  
Cmos Technology ◽  
Common Mode ◽  
Op Amp ◽  
Wide Range ◽  
Differential Difference Amplifier ◽  
Unity Gain ◽  
Folded Cascode ◽  
Speed And Accuracy

A high-speed and high-accuracy continuous-time common-mode feedback block (CMFB) is presented. To satisfy speed and accuracy requirements, some modifications have been applied on differential difference amplifier (DDA) CMFB circuit. The proposed method is applied to a folded cascode op-amp with power supply of 3.3 V. In order to verify the proposed circuit, simulations are done in 0.35 μm standard CMOS technology. In the worst condition when the output common-mode (CM) voltage is initialized to VCC or GND, only 1.1 ns is required to set the output CM voltage on the desired level. Also in a wide range of input CM voltage variations, the deviation of the output CM voltage from reference voltage is less than 6 mV, so simulation results confirm the expected accuracy and speed while simultaneously the proposed CMFB circuit preserves other characteristics of DDA CMFB circuit such as unity gain frequency, 3-dB bandwidth, phase margin and linearity.

scholarly journals Low Power Data Acquisition System for Bioimplantable Devices

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Sadeque Reza Khan ◽  
M. S. Bhat
Keyword(s):  
Low Power ◽  
Data Acquisition ◽  
Sampling Rate ◽  
Cmos Technology ◽  
Biological Tissues ◽  
Low Noise ◽  
Signal Acquisition ◽  
Fully Differential ◽  
Successive Approximation Adc ◽  
Data Acquisition Unit

Signal acquisition represents the most important block in biomedical devices, because of its responsibilities to retrieve precise data from the biological tissues. In this paper an energy efficient data acquisition unit is presented which includes low power high bandwidth front-end amplifier and a 10-bit fully differential successive approximation ADC. The proposed system is designed with 0.18 µm CMOS technology and the simulation results show that the bioamplifier maintains a wide bandwidth versus low noise trade-off and the proposed SAR-ADC consumes 450 nW power under 1.8 V supply and retain the effective number of bit 9.55 in 100 KS/s sampling rate.

scholarly journals A Complementary Recycling Operational Transconductance Amplifier with Data-Driven Enhancement of Transconductance

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1457 ◽  
Author(s):  
Xiang Li ◽  
Bo Hou ◽  
Chunge Ju ◽  
Qi Wei ◽  
Bin Zhou ◽  
...  
Keyword(s):  
Cmos Technology ◽  
Data Driven ◽  
Experimental Result ◽  
Slew Rate ◽  
Operational Transconductance Amplifier ◽  
Common Mode ◽  
Fully Differential ◽  
Transconductance Amplifier ◽  
Good Potential ◽  
Fast Settling

An improved operational transconductance amplifier (OTA) is presented in this work. The fully differential OTA adopts the current recycling technique and complementary NMOS and PMOS input branches to enhance the total transconductance. Moreover, in order to achieve higher current efficiency, a data-driven biasing circuit was developed to dynamically adjust the power consumption of the amplifier. Two comparators were added to detect the voltage difference at the input nodes, and when the differential input is large enough to activate either comparator, extra biasing current is activated and poured into the amplifier to enhance its slew rate and gain-bandwidth product (GBW). The threshold voltage of the complementary recycling folded cascode (CRFC)-based comparator is configured to suppress overshoot. Complementary common-mode feedback (CMFB) topology with local CMFB structure is built to acquire high common-mode gain. The OTA was fabricated in SMIC 0.18- μ m CMOS technology. The experimental result based on a capacitive feedback loop shows that the data-driven operation improves the average slew rate of the amplifier from 10.2 V/ μ s to 55.5 V/ μ s while the power only increases by 150%. The OTA has good potential to satisfy the fast settling demands for capacitive sensing circuits.

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