Bandwidth-Enhanced High Current Efficiency Class-AB Buffer With Very Low Output Resistance

Paul, Anindita; Ramírez-Angulo, J.; Torralba, A.

doi:10.1109/tcsii.2017.2759267

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…This allows FVF circuits to significantly improve their bandwidth with respect to the conventional voltage follower of Figure 1a. This simple but effective FVF compensation and bandwidth extension technique was reported in [10].…”

Section: Class Ab Operation Of Proposed Voltage Followermentioning

confidence: 99%

Class AB Voltage Follower and Low-Voltage Current Mirror with Very High Figures of Merit Based on the Flipped Voltage Follower

Ramírez-Angulo

Paul

Gangineni

et al. 2023

JLPEA

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The application of the flipped voltage follower to implement two high-performance circuits is presented: (1) The first is a class AB cascode flipped voltage follower that shows an improved slew rate and an improved bandwidth by very large factors and that has a higher output range than the conventional flipped voltage follower. It has a small signal figure of merit FOMSS = 46 MHz pF/µW and a current efficiency figure of merit FOMCE = 118. This is achieved by just introducing an additional output current sourcing PMOS transistor (P-channel Metal Oxide Semiconductor Field Effect Transistor) that provides dynamic output current enhancement and increases the quiescent power dissipation by less than 10%. (2) The other is a high-performance low-voltage current mirror with a nominal gain accuracy better than 0.01%, 0.212 Ω input resistance, 112 GΩ output resistance, 1 V supply voltage requirements, 0.15 V input, and 0.2 V output compliance voltages. These characteristics are achieved by utilizing two auxiliary amplifiers and a level shifter that increase the power dissipation just moderately. Post-layout simulations verify the performance of the circuits in a commercial 180 nm CMOS (Complementary Metal Oxide Semiconductor) technology.

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Section: Class Ab Operation Of Proposed Voltage Followermentioning

confidence: 99%

Class AB Voltage Follower and Low-Voltage Current Mirror with Very High Figures of Merit Based on the Flipped Voltage Follower

Ramírez-Angulo

Paul

Gangineni

et al. 2023

JLPEA

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“…Two high gain pseudo-differential auxiliary amplifiers AuxN and AuxP are used to implement regulated cascode transistors M CP1 , M CP2, and M CN1 , M CN2 , in the second stage, respectively. The pseudo-differential auxiliary amplifiers with gains A AuxN and A AuxP consist of two single-ended folded double cascoded amplifiers in combination with a cascoded flipped voltage follower (CASFVF) [14]. This CASFVF acts as a DC floating voltage source to set the voltages at nodes Y 1 , Y 1 ', X .…”

Section: A Topology Of Proposed Op-ampmentioning

confidence: 99%

“…These consist of two single-ended folded double cascoded amplifiers. They share a cascoded FVF or CASFVF [13,14]…”

Section: Gain Of Auxiliary Amplifiersmentioning

confidence: 99%

“…In this paper, a power-efficient super-gain-boosted bandwidth enhanced fully differential class AB-AB Miller op-amp based on regulated cascode techniques with a DC open-loop gain A OLDC =(A i 6 /8) (~156dB in 130nm CMOS technology) is introduced. Very high gain pseudo-differential auxiliary amplifiers that do not require a common-mode feedback network are implemented using two novel singleended folded double cascoded amplifiers in combination with a cascoded flipped voltage follower [13,14] (CASFVF). The CASFVF operates as a DC floating voltage source that accurately sets the internal voltages X1, X1' and Y1, Y1' to convenient reference values V ref-X1 and V ref-Y1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

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Super-Gain-Boosted AB-AB Fully Differential Miller Op-Amp With 156dB Open-Loop Gain and 174MV/V MHZ pF/μW Figure of Merit in 130nm CMOS Technology

et al. 2021

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A fully differential Miller op-amp with a composite input stage using resistive local commonmode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used to implement the regulated cascode transistors in order to boost the output impedance of the composite input stage and the open-loop gain of the op-amp. Both input and output stages operate in class AB mode. The proposed op-amp has been simulated in a 130nm commercial CMOS process technology. It operates from a 1.2V supply and has a close to rail-to-rail differential output swing. It has 156dB DC openloop gain and 63MHz gain-bandwidth product with a 30pF capacitive load. The op-amp has a DC open-loop gain figure of merit FOM AOLDC of 174 (MV/V) MHz pF/µW and large-signal figure of merit FOM LS of 3(V/µs) pF/µW.

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“…Though class AB operation can improve the current efficiency of the op-amp and decrease the linear part of the settling time, the exponential part of the settling time, determined by GBW, and phase margin (PM) can still lead to long total settling times in class AB op-amps. Hence to implement a high-speed op-amp both SR and GBW need to be improved simultaneously [5].…”

Section: Two-stage Class-a Miller Op-ampmentioning

confidence: 99%

Pseudo-Three-Stage Miller Op-Amp With Enhanced Small-Signal and Large-Signal Performance

Paul

Ramírez-Angulo

Lopez-Martin

et al. 2019

IEEE Trans. VLSI Syst.

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A simple technique to implement highly power efficient class AB-AB Miller op-amps is presented in this paper. It uses a composite input stage with resistive local common mode feedback that provides class AB operation to the input stage and essentially enhances the op-amp's effective transconductance gain, the dc open-loop gain, the gain-bandwidth product, and slew rate with just moderate increase in power dissipation. The experimental results of op-amps in strong inversion and subthreshold fabricated in a 130-nm standard CMOS technology validate the proposed approach. The op-amp has 9 V•pF/µs•µW large-signal figure of merit (FOM) and 17 MHz • pF/µW smallsignal FOM with 1.2-V supply voltage. In subthreshold, the op-amp has 10 V • pF/µs • µW large-signal FOM and 92 MHz • pF/µW small-signal FOM with 0.5-V supply voltage. Index Terms-Analog integrated circuits, class AB-AB Miller op-amps, Miller compensation, resistive local common mode feedback. I. INTRODUCTIONT HE increasing demand for battery-operated portable electronics equipment requires power-efficient analog circuits. The operational amplifier (op-amp) is the essential building block of analog signal processing units [1], [2]. Due to the reduction of the supply voltage in deep submicrometer mixed-signal design, the op-amp may suffer from slew rate limitation, insufficient bandwidth, lower gain, reduced dynamic range, inadequate noise performance, and linearity problems [3]. Hence, the energy-efficient high-speed

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Bandwidth-Enhanced High Current Efficiency Class-AB Buffer With Very Low Output Resistance

Cited by 11 publications

References 8 publications

Class AB Voltage Follower and Low-Voltage Current Mirror with Very High Figures of Merit Based on the Flipped Voltage Follower

Class AB Voltage Follower and Low-Voltage Current Mirror with Very High Figures of Merit Based on the Flipped Voltage Follower

Super-Gain-Boosted AB-AB Fully Differential Miller Op-Amp With 156dB Open-Loop Gain and 174MV/V MHZ pF/μW Figure of Merit in 130nm CMOS Technology

Pseudo-Three-Stage Miller Op-Amp With Enhanced Small-Signal and Large-Signal Performance

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