A CMOS LDO regulator with high PSR using Gain Boost-Up and Differential Feed Forward Noise Cancellation in 65nm process

Yuk, Young-Sub; Jung, Seungchul; Lee, Byunghun; Wang, Se-Won; Kim, Chul; Cho, Gyu‐Hyeong

doi:10.1109/esscirc.2012.6341355

Cited by 7 publications

(7 citation statements)

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“…1. (a) Input to output noise paths on a general LDO regulator; and power supply rejection comparison between: (b) without and with conventional PSR enhancer [7], (c) with conventional and proposed techniques enhanced LDR control stages [4], [6], or separated compensation ripple injection such as [3], [7], [8]. Albeit effective, the performance variation versus process scaling of these techniques is usually not considered.…”

Section: Introductionmentioning

confidence: 98%

“…Albeit effective, the performance variation versus process scaling of these techniques is usually not considered. Intuitively, for more advanced technologies with smaller transistor length, it already consumes more power to provide a high dc gain [3]; and feedforward ripple rejection techniques are thus favorable because it merely targets at constructing a pathway for supply ripple, as long as the ripple is scaled for various load conditions in frequency range of interest.…”

Section: Introductionmentioning

confidence: 99%

“…In the past decade, PSR enhancement techniques are proposed, and can mainly be categorized as three types, such as: (1) cascoding an NMOS with PMOS to provide shielding [2], but a charge pump has to be utilized to leave enough headroom and maintain efficiency; (2) boosting the gain and/or extending the bandwidth of the LDR in [3], [4], however, it consumes lots of power even in standby mode; (3) feeding the supply noise in a forward path, either in voltage-mode [5], [6] or in current-mode [7], [8], and operation of the PSR enhancer can be stirless to the working LDR with careful designs.…”

Section: Introductionmentioning

confidence: 99%

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Switch-less adaptive feed-forward supply noise cancellation technique for capacitor-less LDR

Yang

Mok

2014

2014 IEEE 57th International Midwest Symposium on Circuits and Systems (MWSCAS)

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An adaptive feed-forward power supply noise cancellation technique for low-dropout regulator (LDR) which requires no switches is proposed in this paper. By utilizing replica, transconductances (gm, gds) of the large pass transistor are linearly reproduced to construct a load-current-depedent ratioed feed-forward path from supply to gate of pass transistor. The power supply rejection (PSR) capability is enhanced by adaptively feeding compensation charging current to gate parasitic capacitor of the pass transistor, which is effective in a wide load range. The idea of the PSR enhancement technique is implemented in an output capacitor-less LDR in a standard 65-nm CMOS process. The total on-chip capacitance for compensation and low-pass filtering is 40pF. The output is 1.0V and delivers a maximum current of 50mA at 200mV drop-out. Simulations verify that the PSR is further enhanced in midfrequency range (∼100kHz-10MHz) compared with conventional techniques, without feed-forward ratio selection via switches, and it generates ignorable effects on stability and 200-ns full load transient response.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Switch-less adaptive feed-forward supply noise cancellation technique for capacitor-less LDR

Yang

Mok

2014

2014 IEEE 57th International Midwest Symposium on Circuits and Systems (MWSCAS)

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“…Most published PSRR enhancement techniques focus either on boosting up the loop gain [1] or the loop bandwidth [2] of the regulation loop, or improving the open-loop PSRR using feed-forward ripple cancellation methods [3]- [5], [7]. Thus, it is reasonable to decompose the closed-loop PSRR into the open-loop PSRR and the loop gain function, so that not only the complexity is relieved but it is also easier to evaluate the performance of various PSRR enhancement techniques.…”

Section: A the Open-loop Psrrmentioning

confidence: 99%

“…Various PSRR enhancement techniques have been reported during the last decade [1]- [7]. However, the fundamental facts about the PSRR of generic capacitor-less LDOs have not been studies in detail.…”

Section: Introductionmentioning

confidence: 99%

Transfer Function Analysis of the Power Supply Rejection Ratio of Capacitor-Less LDOs

Feng

Mok

2019

2019 IEEE International Symposium on Circuits and Systems (ISCAS)

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Analysis of Power-Supply-Rejection Enhancement Techniques for Low-Dropout Regulators

Lee,

Park

2024

IEEE Access

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This article presents a comprehensive analysis of power-supply-rejection (PSR) enhancement techniques in low-dropout regulators (LDOs) for efficient power management within systemon-chips (SoCs). The PSR is a critical performance metric for LDOs, as it ensures the suppression of power supply ripple and provides stable output voltages. Various PSR enhancement techniques aimed at enhancing PSR characteristics have been proposed, and this study endeavors to offer insights by analyzing these techniques. PSR enhancement techniques can be broadly categorized into two main categories: supply ripple insensitivity/bandwidth improvement and feedforward supply ripple cancellation (FFRC). Supply ripple insensitivity techniques involve the use of a cascading LDO to pre-regulate the supply ripple in the main LDO loop, and bandwidth improvement techniques focus on improving the ripple suppression bandwidth of the LDO. FFRC techniques aim to mitigate the supply ripple by injecting supply ripple through a feedforward path. In addition to analyzing PSR enhancement techniques, this article discusses recent research trends through a performance comparison. Furthermore, it provides valuable insights into the design and optimization of LDOs for PSR enhancement.INDEX TERMS Low-dropout regulator (LDO), power management unit (PMU), power-supply-rejection (PSR), PSR enhancement, feedforward supply ripple cancellation (FFRC).

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A CMOS LDO regulator with high PSR using Gain Boost-Up and Differential Feed Forward Noise Cancellation in 65nm process

Cited by 7 publications

References 1 publication

Switch-less adaptive feed-forward supply noise cancellation technique for capacitor-less LDR

Switch-less adaptive feed-forward supply noise cancellation technique for capacitor-less LDR

Transfer Function Analysis of the Power Supply Rejection Ratio of Capacitor-Less LDOs

Analysis of Power-Supply-Rejection Enhancement Techniques for Low-Dropout Regulators

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