Indirect feedback compensation of CMOS op-amps

Saxena, Vishal; Baker, R. Jacob

doi:10.1109/wmed.2006.1678278

Cited by 37 publications

(23 citation statements)

References 2 publications

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“…The class of compensation in which the compensation current is fed back indirectly from the output to the internal high impedance node is defined as Indirect Feedback Frequency Compensation [1], [3], [4]. In this method, the compensation capacitor is connected to an internal low impedance node in the first gain stage, which allows indirect feedback of the compensation current from the output node to the internal high-impedance node i.e.…”

Section: Low Voltage Indirect Feedback Compensationmentioning

confidence: 99%

“…Hence, pole splitting can be achieved with a O lower value of the compensation capacitor C C and with a lower value of g m2 . This results in a significantly larger unity gain frequency (f un ) attainable by the op-amp, with lower power consumption and more compact layout, when compared to the Miller compensated op-amps [3], [5]. …”

Section: Low Voltage Indirect Feedback Compensationmentioning

confidence: 99%

“…Two low-frequency non-dominant conjugate poles p 2,3 are from the loading on nodes 1 and 2, while high-frequency parasitic poles p 4 , 5 originate from the low-impedance nodes fbl and fbr. …”

Section: mentioning

confidence: 99%

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Indirect compensation techniques for three-stage CMOS op-amps

Saxena¹,

Baker²

2009

2009 52nd IEEE International Midwest Symposium on Circuits and Systems

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Section: Low Voltage Indirect Feedback Compensationmentioning

confidence: 99%

Section: Low Voltage Indirect Feedback Compensationmentioning

confidence: 99%

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Indirect compensation techniques for three-stage CMOS op-amps

Saxena¹,

Baker²

2009

2009 52nd IEEE International Midwest Symposium on Circuits and Systems

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“…For example, cascode amplifiers is a common concept to improve DC gain, but supply reduction limits their use, leading to the use of cascade amplifiers which are difficult to compensate in frequency. Cascade amplifiers with Miller frequency compensation are commonly used but have limitations in bandwidth because of the large compensation capacitor needed, also its connection between output and gain stages that creates a right-hand-plane zero [2]. A reliable approach to have relatively high DC gain and wide bandwidth is the use of cascade amplifiers with feedforward frequency compensation.…”

Section: Introductionmentioning

confidence: 99%

Robust to PVT enhanced DC gain amplifier using no Miller capacitor feedforward compensation

Ortiz

2014

Analog Integr Circ Sig Process

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This paper presents an operational transconductance amplifier compensated in frequency with a feedforward path implemented with current mirrors. This concept eliminates the need of Miller capacitor and improves performance compared to traditional feedforward topologies in regard to DC gain. Gain enhancement is achieved because of the use of current mirrors which reduces the number of the conductances that are connected to the output and increasing output impedance. Moreover, common mode range is improved by the PMOS differential pair used in the feedforward stage. Simulations results for the designed circuit on the typical UMC 180 nm CMOS process, show a DC gain above 60 dB with a unity gain frequency of 511 MHz, a phase margin (PM) of 49 , a slew rate (SR) of 205 V/ls and a power consumption of 5.1 mW maintaining low variations in regard to process, voltage and temperature variations.

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“…The indirect feedback frequency compensation is reported in [50], [51] and shown in The indirect feedback frequency compensation makes uses of the current iCc to achieve pole splitting. Compared to Miller compensation.…”

Section: Indirect Feedback Frequency Compensationmentioning

confidence: 99%

A CMOS low dropout regulator for internet of things

Jiang¹

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With the growing demand of portable devices or the emergence of Internet-of-Things (IoT) applications, the push for small-size and ultra-low-power Low Dropout (LDO) Regulators becomes the key design agenda. Unfortunately, when approaching ultralow power, the transient performance metrics of the regulator are often significantly reduced. Moreover, the parasitic poles of regulator's devices, which are located at low frequencies, can lead to the instability issue. As such, these undesirable effects pose the serious design challenges in the context of ultra-low quiescent power design constraints. To tackle the stated problems, an ultra-low quiescent power capacitorless LDO regulator is proposed with employment of the transistor degeneration frequency compensation (TDFC) in the adaptive frequency compensation scheme. It can deliver a full loading current range from 0 to 100 mA and provide a 1 V output voltage from a 1.2 V power supply at a capacitive load of 100 pF whilst consuming only 407 nA for the entire regulator architecture. The total on-chip capacitance is 6.5 pF. On top of that, a distributed overshoot reduction (DOVSR) topology is also proposed to tackle the overshoot reduction problem under ultra-low quiescent circuit design. By incorporating the TDFC scheme and the feedforward biasing design, this results in reduced settling time and overshoot voltage with respect to that of the conventional circuit technique.

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Indirect feedback compensation of CMOS op-amps

Cited by 37 publications

References 2 publications

Indirect compensation techniques for three-stage CMOS op-amps

Indirect compensation techniques for three-stage CMOS op-amps

Robust to PVT enhanced DC gain amplifier using no Miller capacitor feedforward compensation

A CMOS low dropout regulator for internet of things

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