DCCII based frequency compensation method for three stage amplifiers

Shahsavari, Sajjad; Biabanifard, Sadegh; Largani, S. Mehdi Hosseini; Hashemipour, Omid

doi:10.1016/j.aeue.2014.08.011

Cited by 47 publications

(30 citation statements)

References 11 publications

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“…For conventional structures, the low‐voltage regime and technology advancements hamper the development of miniaturized amplifiers. In contrast, multistage amplifiers has been reported to possess excellent response regarding advancements of CMOS technology . We know that over the past years, because of technology advancements, the supply voltage has undergone major reduction without any significant intervention on threshold voltage.…”

Section: Introductionmentioning

confidence: 99%

A high‐performance CMOS four‐stage amplifier

Zanjani

Asiyabi

Biabanifard³

2019

Int J Numerical Modelling

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In this paper, we theoretically propose and mathematically describe an effective four‐stage structure in Complementary metal‐oxide‐semiconductor (CMOS) technology based on differential block feedback. The special architecture of frequency compensation network improves frequency response with very small value of compensation capacitor, which results in low die area occupation. The presented novel and simple four‐stage structure is frequency compensated just via single Miller capacitor and a differential block. Symbolical transfer function is calculated, and circuit dynamics are introduced. To well explain theoretical description, the proposed configuration at circuit level is simulated using Taiwan Semiconductor Manufacturing Company Limited (TSMC) 0.18‐μm CMOS technology and HSPICE circuit simulator. The proposed configuration and corresponding circuit benefits from circuit simplicity and low die‐area occupation. The frequency compensation network forms two Miller loops with negative loop gains. Feedback paths are amplified via differential block while feedforward paths are attenuated, leads to improving frequency response compare with conventional structures. Ample simulation results are in good agreement with theoretical description. Leveraging the concept and method proposed four‐stage amplifier exhibits 170 dB, 8.12 MHz, and 90° as direct current (DC) gain, Gain‐BandWidth Product (GBW), and Pase Margin (PM), respectively. The supply voltage is set to 1.8 V, while the simulated circuit consumes 380 μW.

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Section: Introductionmentioning

confidence: 99%

A high‐performance CMOS four‐stage amplifier

Zanjani

Asiyabi

Biabanifard³

2019

Int J Numerical Modelling

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“…Finally, ACBC is known as one of the best techniques for frequency compensation. In this method, the second‐stage gain is increased in high frequency, therefore, improving the overall frequency response of an OTA [9, 14, 16‐35] …”

Section: Introductionmentioning

confidence: 99%

Multistage operational transconductance amplifier frequency compensation technique based on fully differential feedback stage

Zanjani

Khatib

Chabok

2019

Int J Numerical Modelling

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In this article, a new configuration of a three-stage Complementary metaloxide-semiconductor (CMOS) operational transconductance amplifier (OTA) isproposed. It removes the feedforward path while simultaneously amplifying the feedback path in the compensation network. Also, the proposed circuit uses only one small compensation capacitor which makes it appropriate regarding die area. The approach behind is demonstrated through a successful design using 0.18-μm CMOS technology. In fact, the simulated OTA shows better performance in comparison with other methods and achieved 20.2 MHz, 82 , and 124 dB as gain-bandwidth product, phase margin, and DC gain, respectively, and consumes 545 μW @ 1.8 V. K E Y W O R D S

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“…With OPAMP based circuits, the accuracy of the circuit is very dependent of the open loop gain of the OPAMPs [14][15][16][17]. It is possible to compensate by using cascod devices, cascading several stages, compensation techniques [16] and so on. This again causes new problems such as high power consumption and stability issues [19].…”

Section: Introductionmentioning

confidence: 99%