Active-bootstrapped gain-enhancement technique for low-voltage circuits

Seevinck, E.; Plessis, Monuko du; Joubert, Trudi-Heleen; Theron, Annette J.

doi:10.1109/82.718592

Cited by 26 publications

(17 citation statements)

References 8 publications

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“…To calculate the output resistance, the transistors are replaced with their small-signal representation and V r is set to zero, Fig.3. In this case, we have: (3) From this, the output resistance is obtained as: (4) where we have defined:…”

Section: Oversampled Gain-enhancementmentioning

confidence: 99%

“…It is interesting to note that the result in (4) provides the output resistance in the z-domain. According to (4), at low frequency the output resistance, R out, tends to infinity. In fact, if a voltage step is applied to the output, the current i s will tend to zero after a few clock periods.…”

Section: Oversampled Gain-enhancementmentioning

confidence: 99%

“…This clearly limits the voltage swing at the output. Activebootstrapped gain-enhancement [4] is a similar technique proposed for two-stage amplifiers, Fig.1-c. This technique is very attractive for low-voltage operation because a high gain is achieved without stacking transistors in the output branch or even sacrificing the circuit bandwidth [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oversampled gain-boosting

Oliaei

2002

Proceedings of the 2002 International Symposium on Low Power Electronics and Design - ISLPED '02

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Section: Oversampled Gain-enhancementmentioning

confidence: 99%

Section: Oversampled Gain-enhancementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oversampled gain-boosting

Oliaei

2002

Proceedings of the 2002 International Symposium on Low Power Electronics and Design - ISLPED '02

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“…To make it stable, the impedance at its input node should be larger than that at its output node. A detailed stability analysis for this type of CM circuits is discussed in [11]. Due to the amplifier feedback, the circuit copies its output node voltage to its input node.…”

Section: Fig 1 Techniques To Improve CM Output Resistancementioning

confidence: 99%

“…A CM circuit with current compensation technique is shown in Figure 1 (c) [4,7,11]. It uses an amplifier to keep the drain voltages of M1 and M2 at the same level.…”

Section: Fig 1 Techniques To Improve CM Output Resistancementioning

confidence: 99%

Current compensation techniques for low-voltage high-performance current mirror circuits

Leitner

Wang

2016

Analog Integr Circ Sig Process

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This paper presents two current mirror circuits for low-voltage applications. Unlike most current mirrors that use stacked transistors in the output branch to boost the output resistance, the proposed designs use current compensation techniques to achieve high output resistance. By avoiding stacked transistors in the output branch, the minimum output voltages of the proposed circuits are significantly lower compared to those of other current mirror circuits with comparable output resistance. Particularly, the first design emphasizes on reducing the minimum output voltage to an extremely low level of around 20mV. The second design stresses minimizing implementation cost. Compared to a simple current mirror circuit, the second design requires only one additional transistor but boosts the output resistance by more than 10 times. Both circuit analysis and simulations are presented to examine the performance of the proposed designs.

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A family of AC amplifiers for ultra‐low frequency operation

Martincorena-Arraiza

Carlosena

Blas

et al. 2021

Circuit Theory & Apps

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A family of capacitively coupled alternating current (AC) amplifiers featuring ultra-low (below 1 Hz) corner frequency is presented. This is achieved by using high-gain devices which actively boost feedback resistance and thus reduce corner frequency. This procedure is often termed, though with a different purpose, as "bootstrapping." The proposed architectures are very general and admit several possible practical implementations. To demonstrate their usefulness, the circuits are implemented with two operational amplifiers (OA), but other active devices such as operational transconductance amplifiers (OTAs) can be alternatively used. All circuits have been theoretically analyzed, extensively simulated and measured, exhibiting high-pass cutoff frequencies as low as 30 mHz.

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Active-bootstrapped gain-enhancement technique for low-voltage circuits

Cited by 26 publications

References 8 publications

Oversampled gain-boosting

Oversampled gain-boosting

Current compensation techniques for low-voltage high-performance current mirror circuits

A family of AC amplifiers for ultra‐low frequency operation

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