An Integrated Wideband Operational Transconductance Amplifier with Complementary Slew-Rate Enhancer

2020 ◽  
Vol E103.A (1) ◽  
pp. 295-296 ◽  
Author(s):  
Deng-Fong LU ◽  
Chin HSIA ◽  
Kun-Chu LEE
Keyword(s):  
Slew Rate ◽  
Operational Transconductance Amplifier ◽  
Transconductance Amplifier

Low Power Operational Transconductance Amplifier (OTA) with Enhanced DC Gain and Slew-Rate

2013 ◽  
Vol 411-414 ◽  
pp. 1645-1648
Author(s):  
Xiao Zong Huang ◽  
Lun Cai Liu ◽  
Jian Gang Shi ◽  
Wen Gang Huang ◽  
Fan Liu ◽  
...  
Keyword(s):  
Low Voltage ◽  
Cmos Technology ◽  
Optimization Techniques ◽  
Current Mirror ◽  
Slew Rate ◽  
Operational Transconductance Amplifier ◽  
Theory Analysis ◽  
Transconductance Amplifier ◽  
Dc Gain ◽  
Simulation Results

This paper presents a low-voltage differential operational transconductance amplifier (OTA) with enhanced DC gain and slew-rate. Based on the current mirror OTA topology, the optimization techniques are discussed in this work. The proposed structure achieves enhanced DC gain, unit gain frequency (UGF) and slew-rate (SR) with adding four devices. The design of the OTA is described with theory analysis. The OTA operates at the power supply of 1.8V. Simulation results for 0.18μm standard CMOS technology show that the DC gain increases from 60.6dB to 65dB, the UGF is optimized from 2.5MHz to 4.3MHz, the SR is enhanced from 0.88 V/μs to 4.8 V/μs with close power consumption dramatically.

Design of high speed 2-stage OTA for high capacitive load of 120pF and 2.96V

2021 ◽  
Author(s):  
Rohit S Ghatikar ◽  
Nithin M
Keyword(s):  
High Speed ◽  
Slew Rate ◽  
Operational Transconductance Amplifier ◽  
Process Technology ◽  
Charging Time ◽  
Transconductance Amplifier ◽  
Capacitive Load ◽  
Resistive Feedback ◽  
Gain Compensation

Abstract High speed operational transconductance amplifier (OTA) is used to drive high capacitive loads to reduce the charging time while providing adequate gain and stability. A 2-stage amplifier is proposed to provide high slew rate and sufficient gain and stability. 45nm process technology is used to compare performance with differential and telescopic amplifier designs. Resistive feedback and noise-gain compensation techniques are used to drive 120pF load and provide 2.96V at output for a high slew rate of 2.2V/µs.

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.

Sign in / Sign up

Export Citation Format

Share Document