Highly Power-Efficient Active-RC Filters With Wide Bandwidth-Range Using Low-Gain Push-Pull Opamps

Ye, Le; Shi, Chunqi; Liao, Huailin; Huang, Ru; Wang, Yangyuan

doi:10.1109/tcsi.2012.2215700

Cited by 78 publications

(40 citation statements)

References 22 publications

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“…So long as the GBW of the Opamp meets the close-loop BW requirement, the Opamp current could be turned into different modes. In active-RC topology, the close-loop BW requires a large GBW of the core Opamp, typically given as (1) [19], where G, Q, and f c are the gain, quality factor, and BW of the biquad respectively.…”

Section: B Power-scalable Schemementioning

confidence: 99%

“…Even a high power-efficient Opamp with pole-cancellation push-pull source follower (APP-SF) in 0.18 um CMOS is proposed in [19], it might not suitable for advanced deep-submicron process due to the multiple-MOSFET-stacked architecture. Fortunately, a highly powerefficient Opamp with differential active balun buffer is proposed for the reconfigurable MABB as Fig.…”

Section: Flexible Opampmentioning

confidence: 99%

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Highly Reconfigurable Analog Baseband for Multistandard Wireless Receivers in 65-<roman>nm</roman> CMOS

Wang

Liao

et al. 2015

IEEE Trans. Circuits Syst. II

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A highly reconfigurable merged analog baseband (MABB) with not only tunable bandwidth, gain and order, but also reconfigurable power, noise and linearity is proposed for multi-standard integrated wireless receivers in this paper. The MABB could arrange the total gain to different stages for noise and linearity trade-offs by introducing the merged biquad topology. To save power, the Opamp for the proposed MABB can reduce the GBW, as long as meeting the GBW requirement for different bandwidth, gain, and order. A flexible power-efficient high-GBW Opamp with an adaptive common-mode bias circuit is also proposed for the 8 th -order active-RC MABB. The proposed MABB covers a cut-off frequency range from 200 kHz to 20 MHz, while the gain could be tuned between 0 and 72 dB. The proposed highly reconfigurable MABB is suitable for multistandard integrated wireless receivers.

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Section: B Power-scalable Schemementioning

confidence: 99%

Section: Flexible Opampmentioning

confidence: 99%

Highly Reconfigurable Analog Baseband for Multistandard Wireless Receivers in 65-<roman>nm</roman> CMOS

Wang

Liao

et al. 2015

IEEE Trans. Circuits Syst. II

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“…Regarding adaptive biasing in [3] for decreasing current during sampling phase, this scheme is only suitable for switched capacitor circuit. [1], [5] class AB output stages also realize large output current boosting, but they are at the cost of low gain, which is not desired in high GBP design. To achieve high gain, high gain cascode Opamps [2], [3] are limited to a very low output voltage swing, under 1-V supply.…”

Section: Circuit Topology Synthesis Through Reasoningmentioning

confidence: 99%

“…Super class AB OTAs [4] combine class AB differential input stage and local common mode feedback, resulting in additional dynamic current boosting and near optimal current efficiency. Push-pull and drain-todrain class AB output stages [1], [5], achieve current boosting and bandwidth enhancement. Designs in [1], [4], [5] are all low gain Opamps.…”

Section: Introductionmentioning

confidence: 99%

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A low-voltage, low-power amplifier created by reasoning-based, systematic topology synthesis

Jiao

Doboli

2015

2015 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper introduces a three stage low voltage, low power amplifier created by a design knowledge-intensive circuit topology synthesis methodology. The synthesis method flow begins with a set of starting ideas and then continues with a sequence of justified, causal design steps. Starting ideas combine physical and abstract features from either previous design or new insight. After combining the starting ideas, the related design sequence is identified step by step, so that each step either improves performance or relaxes design constraints. The created Opamp is a novel low voltage, low power circuit with better setting time (small signal characteristic) and slew rate (large signal characteristic). The proposed Opamp is realized in 0.2-µm CMOS technology. At 1-V supply voltage, it consumes less than 70µW static power. When driving a 5-pF capacitive load, the amplifier achieves 24MHz gain-bandwidth-product (GBW) and 5.1-V/µs average slew rate.

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Bandwidth extension, linearity enhancement, and cost reduction techniques for continuous‐time channel‐select filters

Mojarad

Kamarei

2016

Circuit Theory & Apps

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Summary Achieving a wide bandwidth in a conventional active‐RC filter requires large power consumption and is often accompanied by significant performance degradation. In this paper, a new structure to implement active‐RC continuous‐time filters and also a new frequency compensation scheme for the operational amplifiers that are the main building blocks of active‐RC filters are proposed. Exploiting these techniques increases the maximum possible bandwidth with lower power consumption in comparison with the conventional architectures, reduces die area, and enhances the dynamic range. The effectiveness of these methods has been verified by analysis and simulation of the conventional and proposed filters under identical conditions. Both the analytical investigations and extensive simulation results prove that the adopted techniques improve the performance of continuous‐time filters considerably in terms of bandwidth and linearity while reducing the die area. Simulations have been carried out in a standard 90‐nm CMOS process by using Advanced Design System (ADS), and the proposed filter features 11.08‐dB spurious‐free dynamic range improvement and 5.9 times bandwidth enhancement. Also, the total on‐chip capacitance is made 2.4 times smaller by using the new biquad structure. Copyright © 2016 John Wiley & Sons, Ltd.

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Highly Power-Efficient Active-RC Filters With Wide Bandwidth-Range Using Low-Gain Push-Pull Opamps

Cited by 78 publications

References 22 publications

Highly Reconfigurable Analog Baseband for Multistandard Wireless Receivers in 65-<roman>nm</roman> CMOS

Highly Reconfigurable Analog Baseband for Multistandard Wireless Receivers in 65-<roman>nm</roman> CMOS

A low-voltage, low-power amplifier created by reasoning-based, systematic topology synthesis

Bandwidth extension, linearity enhancement, and cost reduction techniques for continuous‐time channel‐select filters

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