Performance enhancement of advanced recycling folded cascode operational transconductance amplifier using an unbalanced biased input stage

Integration ◽  
2019 ◽  
Vol 69 ◽  
pp. 242-250 ◽  
Author(s):  
Amitkumar S. Khade ◽  
Vibha Vyas ◽  
Mukul Sutaone
Keyword(s):  
Performance Enhancement ◽  
Operational Transconductance Amplifier ◽  
Input Stage ◽  
Transconductance Amplifier ◽  
Folded Cascode

Design of High Gain Folded Cascode OTA-Based Transconductance–Capacitance Loop Filter for PLL Applications

2021 ◽  
pp. 2150263
Author(s):  
Priti Gupta ◽  
Sanjay Kumar Jana
Keyword(s):  
Power Consumption ◽  
Supply Voltage ◽  
High Gain ◽  
Cmos Process ◽  
Operational Transconductance Amplifier ◽  
Loop Filter ◽  
Transconductance Amplifier ◽  
Dc Gain ◽  
Unity Gain ◽  
Folded Cascode

This paper deals with the designing of low-power transconductance–capacitance-based loop filter. The folded cascode-based operational transconductance amplifier (OTA) is designed in this paper with the help of quasi-floating bulk MOSFET that achieved the DC gain of 88.61[Formula: see text]dB, unity gain frequency of 97.86[Formula: see text]MHz and power consumption of 430.62[Formula: see text][Formula: see text]W. The proposed OTA is compared with the exiting OTA structure which showed 19.50% increase in DC gain and 15.11% reduction in power consumption. Further, the proposed OTA is used for the designing of transconductance–capacitance-based loop filter that has been operated at [Formula: see text]3[Formula: see text]dB cut-off frequency of 30.12[Formula: see text]MHz with the power consumption of 860.90[Formula: see text][Formula: see text]W at the supply voltage of [Formula: see text][Formula: see text]V. The transistor-level simulation has been done in 0.18[Formula: see text][Formula: see text]m CMOS process.

A High-Temperature Folded-Cascode Operational Transconductance Amplifier in 0.8-μm BCD-on-SOI

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000083-000088
Author(s):  
C. Su ◽  
B. J. Blalock ◽  
S. K. Islam ◽  
L. Zuo ◽  
L. M. Tolbert
Keyword(s):  
High Temperature ◽  
Analog Circuits ◽  
Flicker Noise ◽  
Data Converters ◽  
Open Loop ◽  
Automotive Electronics ◽  
Operational Transconductance Amplifier ◽  
Linear Regulator ◽  
Transconductance Amplifier ◽  
Folded Cascode

The rapid growth of the hybrid electric vehicles (HEVs) has been driving the demand of high temperature automotive electronics target for the engine compartment, power train, and brakes where the ambient temperature normally exceeds 150°C. An operational transconductance amplifier (OTA) is an essential building block of various analog circuits such as data converters, instrumentation systems, linear regulators, etc. This work presents a high temperature folded cascode operational transconductance amplifier designed and fabricated in a commercially available 0.8-μm BCD-on-SOI process. SOI processes offer several orders of magnitude smaller junction leakage current than bulk-CMOS processes at temperatures beyond 150°C. This amplifier is designed for a high temperature linear voltage regulator; the higher open-loop gain of this amplifier will enhance the overall performance of a linear regulator. In addition, the lower current consumption of the OTA is critical for improving the current efficiency of the linear regulator and reducing the power dissipation at elevated temperature. A PMOS input pair folded cascode OTA topology had been selected in this work, PMOS input pair offers wider ICMR (input common-mode range) and empirically lower flicker noise compared to its NMOS counterpart. By cascoding current mirror load at the output node, the folded cascode OTA obtains higher voltage gain than the symmetrical OTA topology. The PSRR (power supply rejection ratio) is also improved. A on-chip temperature stable current reference is employed to bias the amplifier. The amplifier consumes less than 65μA bias current at 175°C. The core layout area of the amplifier is 0.16mm2 (400 μm × 400 μm).

A Low-Noise High-Gain Recycling Folded Cascode Operational Transconductance Amplifier Based on Gate Driven and Quasi-Floating Bulk Technique

2021 ◽  
Author(s):  
Roowz Saini ◽  
Kulbhushan Sharma ◽  
Rajnish Sharma
Keyword(s):  
Power Consumption ◽  
Supply Voltage ◽  
Cmos Technology ◽  
Monte Carlo Analysis ◽  
High Gain ◽  
Low Noise ◽  
Operational Transconductance Amplifier ◽  
Sensor Applications ◽  
Transconductance Amplifier ◽  
Folded Cascode

Operational Transconductance Amplifier (OTA) is an important circuit block used in the design of filter, amplifiers and oscillators for various analog-mixed circuit systems. However, design of a low-noise, high-gain OTA with low-power consumption is a challenging task in CMOS technology owing to high-power requirements of OTA for emulating high gain. This paper represents the design of gate-driven quasi-floating bulk recycling folded cascode (GDQFB RFC) OTA which has been shown to provide low-noise operation, emulates high gain and draws very less power. The design utilizes the gate-driven quasi-floating bulk (GDQFB) technique on a recycling folded cascode structure, which enhances the transconductance of OTA and improves its performance. All the post-layout simulation results have been obtained in 0.18-[Formula: see text]m CMOS N-well technology using BSIM3V3 device models. The obtained results indicate very high gain of 100.4 dB, gain-bandwidth of 69[Formula: see text]kHz, phase margin of 51.9∘ with power consumption of 2.31[Formula: see text][Formula: see text]W from [Formula: see text][Formula: see text]V supply voltage. The input referred noise emulated by proposed OTA is 0.684, 0.21 and 0.0592[Formula: see text][Formula: see text]V/[Formula: see text]Hz @ 1[Formula: see text]Hz, 10[Formula: see text]Hz and 1[Formula: see text]kHz, respectively. The input common mode range and output voltage swing are found to be [Formula: see text] to 0.669[Formula: see text]V and [Formula: see text] to 0.610[Formula: see text]V, respectively. Corner simulations and Monte Carlo analysis have been performed to verify the robustness of the proposed OTA. The proposed OTA can be used in design of filters and amplifiers for bio-instruments, sensor applications, neural recording applications and human implants etc.

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