Low Power Cascaded Three Stage Amplifier with Multipath Nested Miller Compensation

Menon, Maneesh; Dhall, Karan; Gupta, Anu; Chaturvedi, Nitin Dutt

doi:10.1109/itc.2010.98

Cited by 4 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A capacitor C BAT connected between the gates of M OP and M ON acts as a short circuit at high frequencies and helps to provide large negative dynamic currents to the capacitive load. Additionally, C BAT eliminates the need for an additional compensation capacitor between node Y and the op-amp output as it is required in several reported class-AB op-amp implementations [12][13][14]. Conventional Miller compensation is used for stability purposes.…”

Section: Proposed Op-ampmentioning

confidence: 99%

“…This capacitor short circuits node X and Y at high frequencies, allowing high dynamic current efficiency and utilization of only one compensation capacitance C C instead of two. It is common in several reported implementations of class-AB output stages [12][13][14]. A straightforward analysis leads to the well-known transfer function of a Miller op-amp given by (1).…”

Section: Ac Analysis Of Proposed Op-ampmentioning

confidence: 99%

See 1 more Smart Citation

An Enhanced Gain-Bandwidth Class-AB Miller op-amp With 23,800 MHz·pF/mW FOM, 11-16 Current Efficiency and Wide Range of Resistive and Capacitive Loads Driving Capability

et al. 2021

View full text Add to dashboard Cite

A compact power-efficient class-AB Miller op-amp is introduced. It uses a simple auxiliary circuit that enhances the op-amp's gain-bandwidth product and helps to drive a wide range of capacitive and resistive loads with high static and dynamic current efficiency. Simple Miller compensation is used to obtain stability over a wide range of loading conditions. The op-amp's simulation and experimental results in strong inversion with 15µA bias current and in sub-threshold with 250nA bias current are shown. Its performance is measured in terms of dynamic and static current efficiency figures of merit FOM CEDyn and FOM CEStat. and using the conventional small-signal figure of merit FOM SS. Experimental results of op-amps fabricated in a 130nm CMOS technology are shown that validate the proposed approach.

show abstract

Section: Proposed Op-ampmentioning

confidence: 99%

Section: Ac Analysis Of Proposed Op-ampmentioning

confidence: 99%

An Enhanced Gain-Bandwidth Class-AB Miller op-amp With 23,800 MHz·pF/mW FOM, 11-16 Current Efficiency and Wide Range of Resistive and Capacitive Loads Driving Capability

et al. 2021

View full text Add to dashboard Cite

show abstract

“…However, the architecture of a multistage operational amplifier always results in the closed‐loop instability on account of the increased number of high‐resistance nodes. To solve the instability issue, various frequency compensation techniques have been studied [ 6 – 29 ] .…”

Section: Introductionmentioning

confidence: 99%

“…Nested Miller compensation (NMC) is a typical topology, which utilizes the pole splitting trick [ 6 – 10 ] . With the NMC structure, the DC gain can be further increased by additional stages, while the bandwidth is limited inevitably [ 10 ] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A 1.8‐V 240‐MHz 2.19‐mW Four‐Stage CMOS OTA with a Segmenting Frequency Compensation Technique

Liang

Zirui

Liu

et al. 2021

Chinese J of Electronics

View full text Add to dashboard Cite

A four‐stage Operational transconductance amplifier (OTA) used in an infrared temperature sensor adopting the proposed Feed‐forward Gm‐stage and segmenting nested Miller compensation technique is presented. The purpose of the proposed segment compensation is primarily to make more amplifier stages concatenated. The circuit linked several transconductance stages to form a segment, and linked several segments to form a large multistage amplifier. For example, a two‐stage amplifier linked with a three‐stage amplifier can realize a five‐stage amplifier, two three‐stage amplifiers linked can realize a six‐stage amplifier. A four‐stage amplifier in the form of 2+2 (two stages and two stages) was used as an example to verify this compensation method. The proposed OTA is designed in the 180nm complementary metal oxide semiconductor process. It consists of two parts which ensure the stability and improve the bandwidth performance. The first part is a feed‐forward transconductance stage, and the second part is the two‐segment transconductance stages with the Miller compensation techniques employed within and between the two segments. Based on the small‐signal model, stability analysis and theoretical derivation are performed in theory. On condition of a 2‐pF load capacitance, a direct current gain of 109dB and a gain‐bandwidth of 240MHz with a phase margin of 50° can be achieved. The proposed design consumes 2.19mW in a 1.8‐V supply voltage. The transient simulation indicates that the settling time of the output is 19ns with the settling error being 1%, and the slew rate is 114V/μs.

show abstract

RETRACTED ARTICLE: Design of Three Stage Cascaded Low Power CMOS Operational Trans Conductance Amplifier (OTA) for ECG Applications

B¹,

Prasad²,

Kamaraju³

2019

Multimed Tools Appl

View full text Add to dashboard Cite

Low Power Cascaded Three Stage Amplifier with Multipath Nested Miller Compensation

Cited by 4 publications

References 4 publications

An Enhanced Gain-Bandwidth Class-AB Miller op-amp With 23,800 MHz·pF/mW FOM, 11-16 Current Efficiency and Wide Range of Resistive and Capacitive Loads Driving Capability

An Enhanced Gain-Bandwidth Class-AB Miller op-amp With 23,800 MHz·pF/mW FOM, 11-16 Current Efficiency and Wide Range of Resistive and Capacitive Loads Driving Capability

A 1.8‐V 240‐MHz 2.19‐mW Four‐Stage CMOS OTA with a Segmenting Frequency Compensation Technique

RETRACTED ARTICLE: Design of Three Stage Cascaded Low Power CMOS Operational Trans Conductance Amplifier (OTA) for ECG Applications

Contact Info

Product

Resources

About