An ultra high-speed and low-voltage amplifier for switched-capacitor applications

Ahmadpour, A.

doi:10.1109/ecticon.2009.5137067

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…In order to show that the designed OTA will be useful in practical analog circuits, this structure was checked by a typical switched-capacitor (SC) integrator [7,8] with suitable input frequency 1 KHz and sampling frequency 1 MHz. Figure 5 is shown schematic of this structure.…”

Section: Sc Integrator and Active Filter Circuitmentioning

confidence: 99%

An Ultra Low-Voltage and Low-Power OTA Using Bulk-Input Technique and Its Application in Active-RC Filters

Ahmadpour¹

2011

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This paper presents the design of a two-stage bulk-input pseudo-differential operational transconductance amplifier (OTA) and its application in active-RC filters. The OTA was designed in 90 nm CMOS process and operates at a single supply voltage of 0.5 V. Using a two-path bulk-driven OTA by the combination of two different amplifiers the DC gain and speed of the OTA is increased. Rail-to-rail input is made possible using the transistor’s bulk terminal as in input. Also a Miller-Feed-forward (MFF) compensation is utilized which is improved the gain bandwidth (GBW) and phase margin of the OTA. In addition, a new merged cross-coupled self-cascode pair is used that can provide higher gain. Also, a novel cost-effective bulk-input common-mode feedback (CMFB) circuit has been designed. Simplicity and ability of using this new merged CMFB circuit is superior compared with state-of-the-art CMFBs. The OTA has a 70.2 dB DC gain, a 2.5 MHz GBW and a 70.8<sup>o</sup> phase margin for a 20 PF capacitive load whereas consumes only 25 µw. Finally, an 8<sup>th</sup> order Butterworth active Biquadrate RC filter has been designed and this OTA was checked by a typical switched-capacitor (SC) integrator with a 1 MHz clock-frequency

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Section: Sc Integrator and Active Filter Circuitmentioning

confidence: 99%

An Ultra Low-Voltage and Low-Power OTA Using Bulk-Input Technique and Its Application in Active-RC Filters

Ahmadpour¹

2011

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Improvement of frequency performance of fully differential operational amplifier for switched-capacitor application

(李训宇)

2020

2020 7th International Forum on Electrical Engineering and Automation (IFEEA)

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Ultra-Wide Bandwidth Fully Differential CMOS Opamp with a Novel Bandwidth Extension Technique for SoC Active Filter Applications

Kayanselçuk

Zencir

2021

J CIRCUIT SYST COMP

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An ultra-wide bandwidth fully differential two-stage 65[Formula: see text]nm CMOS operational amplifier (Opamp) is presented, which uses a novel bandwidth extension technique called “pole duplication”. This technique is based on relocating the dominant pole with the same location with a non-dominant pole and adjusting 3-dB frequency and stability with a compensation network. Simulation results show that the proposed Opamp has 103[Formula: see text]MHz 3-dB bandwidth with a 2[Formula: see text]pF load capacitor. It consumes 9[Formula: see text]mA current from 1.2-V supply. Transition frequency of 2.4[Formula: see text]GHz and a gain of 29[Formula: see text]dB is accomplished. A 2[Formula: see text]pF load capacitance can be driven at a phase margin of [Formula: see text]. The suggested pole duplication technique is used to achieve higher 3-dB cut-off frequencies by adjusting the load capacitor. Fully differential two-stage Opamp is presented, which uses a novel bandwidth extension technique, is suitable for SoC active filter applications with 40[Formula: see text][Formula: see text]m layout area and ultra-wide 3-dB bandwidth.

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An ultra high-speed and low-voltage amplifier for switched-capacitor applications

Cited by 3 publications

References 14 publications

An Ultra Low-Voltage and Low-Power OTA Using Bulk-Input Technique and Its Application in Active-RC Filters

An Ultra Low-Voltage and Low-Power OTA Using Bulk-Input Technique and Its Application in Active-RC Filters

Improvement of frequency performance of fully differential operational amplifier for switched-capacitor application

Ultra-Wide Bandwidth Fully Differential CMOS Opamp with a Novel Bandwidth Extension Technique for SoC Active Filter Applications

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