Low voltage fully differential OTA using DTMOS based self cascode transistor with slew-rate enhancement and its filter application

In this work, a new composite transistor cell using dynamic body bias technique is proposed. This cell is based on self cascode topology. The key attractive feature of the proposed cell is that body effect is utilized to realize asymmetric threshold voltage self cascode structure. The proposed cell has nearly four times higher output impedance than its conventional version. Dynamic body bias technique increases the intrinsic gain of the proposed cell by 11.17 dB. Analytical formulation for output impedance and intrinsic gain parameters of the proposed cell has been derived using small signal analysis. The proposed cell can operate at low power supply voltage of 1 V and consumes merely 43.1 nW. PSpice simulation results using 180 nm CMOS technology from Taiwan Semiconductor Manufacturing Company (TSMC) are included to prove the unique results. The proposed cell could constitute an efficient analog Very Large Scale Integration (VLSI) cell library in the design of high gain analog integrated circuits and is particularly interesting for biomedical and instrumentation applications requiring low-voltage low-power operation capability where the processing signal frequency is very low.

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A 0.3 V Rail-to-Rail Ultra-Low-Power OTA with Improved Bandwidth and Slew Rate

Journal of Low Power Electronics and Applications ◽

10.3390/jlpea11020019 ◽

2021 ◽

Vol 11 (2) ◽

pp. 19

Author(s):

Francesco Centurelli ◽

Riccardo Della Sala ◽

Pietro Monsurrò ◽

Giuseppe Scotti ◽

Alessandro Trifiletti

Keyword(s):

Low Power ◽

Low Voltage ◽

Supply Voltage ◽

Cmos Process ◽

Slew Rate ◽

Large Signal ◽

Output Stage ◽

Ultra Low Power ◽

Input Stage ◽

Rail To Rail

In this paper, we present a novel operational transconductance amplifier (OTA) topology based on a dual-path body-driven input stage that exploits a body-driven current mirror-active load and targets ultra-low-power (ULP) and ultra-low-voltage (ULV) applications, such as IoT or biomedical devices. The proposed OTA exhibits only one high-impedance node, and can therefore be compensated at the output stage, thus not requiring Miller compensation. The input stage ensures rail-to-rail input common-mode range, whereas the gate-driven output stage ensures both a high open-loop gain and an enhanced slew rate. The proposed amplifier was designed in an STMicroelectronics 130 nm CMOS process with a nominal supply voltage of only 0.3 V, and it achieved very good values for both the small-signal and large-signal Figures of Merit. Extensive PVT (process, supply voltage, and temperature) and mismatch simulations are reported to prove the robustness of the proposed amplifier.

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A 0.25-V 90dB PVT-stabilized Four-stage OTA with Linear Q-factor Modulation and Fast Slew-Rate Enhancement for Ultra-Low Supply ADCs

AEU - International Journal of Electronics and Communications ◽

10.1016/j.aeue.2021.154044 ◽

2021 ◽

pp. 154044

Author(s):

Siwan Dong ◽

Wentao Wang ◽

Xingyuan Tong

Keyword(s):

Q Factor ◽

Slew Rate ◽

Rate Enhancement

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Super class AB transconductor with slew-rate enhancement using QFG MOS techniques

2017 European Conference on Circuit Theory and Design (ECCTD) ◽

10.1109/ecctd.2017.8093308 ◽

2017 ◽

Cited By ~ 1

Author(s):

Carlos A. De La Cruz-Blas ◽

M. Pilar Garde ◽

Antonio Lopez-Martin

Keyword(s):

Slew Rate ◽

Rate Enhancement ◽

Class Ab

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A High-Speed Fully Differential Telescopic Op-Amp for Active Filter Designs in V2X Applications

Journal of Circuits System and Computers ◽

10.1142/s0218126622500955 ◽

2021 ◽

Author(s):

Furkan Barin ◽

Ertan Zencir

Keyword(s):

High Speed ◽

Low Voltage ◽

Supply Voltage ◽

Active Filter ◽

Ultra Wideband ◽

Two Stage ◽

Fully Differential ◽

Op Amp ◽

Current Mirrors ◽

Design Techniques

In this paper, an ultra-wideband fully differential two-stage telescopic 65-nm CMOS op-amp is presented, which uses low-voltage design techniques such as level shifter circuits and low-voltage cascode current mirrors. The designed op-amp consists of two stages. While the telescopic first stage provides high speed and low swing, the second stage provides high gain and large swing. Common-mode feedback circuits (CMFB), which contain five transistors OTA and sensing resistors, are used to set the first-stage output to a known value. The designed two-stage telescopic operational amplifier has 41.04[Formula: see text]dB lower frequency gain, 1.81[Formula: see text]GHz gain-bandwidth product (GBW) and 51.9∘ phase margin under 5[Formula: see text]pF load capacitance. The design consumes a total current of 11.9[Formula: see text]mA from a 1.2-V supply voltage. Presented fully differential two-stage telescopic op-amp by using low-voltage design techniques is suitable for active filter in vehicle-to-everything (V2X) applications with 120[Formula: see text][Formula: see text]m[Formula: see text]m layout area.

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