Advances in Active-Feedback Frequency Compensation With Power Optimization and Transient Improvement

An embedded current amplifier compensation (ECAC) for threestage amplifiers with large capacitive loads is presented in this paper. Two current amplifiers are embedded into the first stage. The compensation capacitor is connected to the input of the current amplifier rather than the output of the first stage, which enables the non-dominant complex poles of the ECAC amplifier to be located at high frequencies for bandwidth extension; in addition, the compensation capacitor required is greatly reduced. The amplifier has been fabricated in a 0.13 µm CMOS process. When driving a 2000 pF capacitive load, the ECAC amplifier achieves 1.85 MHz gain-bandwidth product by dissipating 33.6 µW power at 1.2 V supply and using total compensation capacitance of only 0.8 pF.

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“…Apply the low-power stability strategy in [12], the dimension condition of the compensation capacitor is calculated as…”

Section: Stabilitymentioning

confidence: 99%

Embedded current amplifier compensation for three-stage amplifiers with large capacitive loads

Liao

Chen

Luo

et al. 2016

IEICE Electron. Express

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“…1(b) shows the circuit diagram of SF-TIA and DCB. Three common-source amplifiers with active feedback stage use as a core amplifier of the SF-TIA to enhance a bandwidth [4]. The active feedback amplifier only exhibits a small voltage headroom, 2 times overdrive voltages of NMOS and voltages through 80-Ω load resistor (R D ).…”

Section: Tunable Optical Receiver Using Voltage Scalingmentioning

confidence: 99%

A 1–13 Gbps tunable optical receiver with supply voltage scaling

Park

Kim

Jung

et al. 2014

IEICE Electron. Express

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In this letter, a tunable optical receiver is demonstrated in standard 65-nm complementary metal-oxide-semiconductor technology for universal optical interconnects. With supply voltage scaling, a 3-dB bandwidth, a power efficiency, and a noise performance can be optimized according to the target bitrate. The optical receiver including a shunt-feedback transimpedance amplifier and a limiting amplifier has been designed to have the optimum performance in bitrate ranges from 1 Gbps to 13 Gbps while remaining the transimpedance gain and power efficiency. The prototype chip exhibits −24.2 dBm to −16.8 dBm of optical sensitivity for 10 −12 bit error rate and its power efficiency is less than 5 pJ/bit for all operating frequency range.

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“…AFFC [23,24] eliminates capacitive nesting exploiting an active-capacitive-feedback network, as shown in Figure 9. As a result, only C C2 is directly connected to the output.…”

Section: Active-feedback Frequency Compensation (Affc)mentioning

confidence: 99%

Analytical comparison of frequency compensation techniques in three‐stage amplifiers

Grasso

Palumbo

Pennisi

2006

Circuit Theory & Apps

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SUMMARYIn this paper, design equations of the most common Nested Miller topologies are derived. Moreover, a coherent and comprehensive analytical comparison among the different topologies is also presented. In particular, after deriving design equations, following the approach previously proposed by the authors that have the phase margin as the main design parameter, the different solutions are compared by evaluating a novel figure of merit that expresses a trade-off between gain-bandwidth product, load capacitance and total transconductance, for equal values of phase margin. It is shown that there is no unique optimal solution as this depends on the load condition and the relative magnitude of the transconductance of each stage. From this point of view, the proposed comparison also provides useful design guidelines for the optimization of small-signal performance. Simulations confirming the effectiveness of the comparison are also given.

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Advances in Active-Feedback Frequency Compensation With Power Optimization and Transient Improvement

Cited by 62 publications

References 9 publications

Embedded current amplifier compensation for three-stage amplifiers with large capacitive loads

Embedded current amplifier compensation for three-stage amplifiers with large capacitive loads

A 1–13 Gbps tunable optical receiver with supply voltage scaling

Analytical comparison of frequency compensation techniques in three‐stage amplifiers

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