A modified high-performance structure of low-voltage CMOS Op-amp

Ahmadpour, A.; Fouladi, Reza

doi:10.1109/edssc.2008.4760687

Cited by 6 publications

(2 citation statements)

References 9 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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“…Amps results in large power dissipation (causing unstable operation). Recently, a high speed CMOS OP Amp consisting of a fully differential operational transconductance amplifier (OTA) with two-pair's folded-cascode OP Amps and a common-modefeedback (CMFB) circuit has been developed [8]. This fully differential two-stage OTA was applied for high-gain and highspeed operations of SC applications, and demonstrated a low power dissipation of 10 mW at a high slew rate of 340 V/μs with a power supply voltage of 2 V. However, its circuit, which included several OP Amps, was too complicated for the signal processing IC, and so required a larger chip area and larger power consumption.…”

Section: Introductionmentioning

confidence: 99%

A High-Speed CMOS OP Amplifier with a Dynamic Switching Bias Circuit

Wakaumi

2013

SICE Journal of Control, Measurement, and System Integration

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: This paper presents a high-speed CMOS operational amplifier (OP Amp) with a dynamic switching bias circuit, capable of processing video signals of over 2 MHz with decreased dissipated power. The OP Amp was designed to operate at a 10 MHz dynamic switching rate, and was shown in simulations to have a dissipated power of 66 % of conventional continuous operation. This OP Amp was applied to a switched capacitor (SC) non-inverting amplifier with a gain of 2, and its high-speed 10 MHz dynamic switching operation, capable of processing video signals, was demonstrated. By increasing the switching duty ratio to 70 %, its power dissipation decreased to 56 % of normal operation. Some inaccuracy in the SC amplifier performance resulted mainly from the limited open loop gain of the OP Amp. This circuit configuration should be extremely useful in realizing low-power wide-band signal processing ICs.

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A folded-cascode OP Amp with a dynamic switching bias circuit

Wakaumi

2014

2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

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A modified high-performance structure of low-voltage CMOS Op-amp

Cited by 6 publications

References 9 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

A High-Speed CMOS OP Amplifier with a Dynamic Switching Bias Circuit

A folded-cascode OP Amp with a dynamic switching bias circuit

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