CMOS Fully Differential Feedforward-Regulated Folded Cascode Amplifier

Santin, E.; Figueiredo, Mauro; Goes, J.; Oliveira, Luís B.

doi:10.1007/978-3-642-19170-1_62

Cited by 1 publication

(6 citation statements)

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“…Fig. 3 shows a proposed modified amplifier that employs, simultaneously, regulated-feedforward (RFF) and self-biasing (SB) techniques [7]. This modified FCA amplifier (FCA + RFF + SB) adds an interesting feature which is self-biasing.…”

Section: Using Regulated-feedforward and Self-biasing Techniquesmentioning

confidence: 99%

“…This circuitry is similar to the circuitry shown in Fig.1 but without the biasing circuit and with regulated-feedforward technique. In cascode OTAs using regulated common-gate devices through negative feedback (usually called "regulated-cascodes"), the feedback network always introduces a delay during the voltage regulation process [7]. In the circuitry shown in Fig.3, is used instead a regulated-feedforward approach (a sort of adding a small amount of positive feedback) to diminish time delay in the regulation of the common-gate devices and, thereby, significantly increase its operating speed [7].…”

Section: Using Regulated-feedforward and Self-biasing Techniquesmentioning

confidence: 99%

“…In cascode OTAs using regulated common-gate devices through negative feedback (usually called "regulated-cascodes"), the feedback network always introduces a delay during the voltage regulation process [7]. In the circuitry shown in Fig.3, is used instead a regulated-feedforward approach (a sort of adding a small amount of positive feedback) to diminish time delay in the regulation of the common-gate devices and, thereby, significantly increase its operating speed [7]. It has differential inputs and differential outputs, which allows the circuit to be used in both positive and negative feedback system configurations [7].…”

Section: Using Regulated-feedforward and Self-biasing Techniquesmentioning

confidence: 99%

“…This idea basically relies in two combined techniques, namely regulated-feedforward and self-biasing techniques. Any feedback network always introduces a delay during the voltage regulation process [7]. If this time delay is reduce by employing regulatedfeedforward, it becomes possible to significantly increase its operating speed [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Any feedback network always introduces a delay during the voltage regulation process [7]. If this time delay is reduce by employing regulatedfeedforward, it becomes possible to significantly increase its operating speed [7,8]. Additionally, the advantages of employing self-biasing techniques are also well known [6]: 1) they simplify the implementation of amplifiers by removing biasing circuitry, thus saving power and die area; 2) any mismatches and variations in circuits performance due to deviations in biasing voltages are highly attenuated; 3) they enable circuits to be more insensitive to process, supply voltage, and temperature (PVT) variations [1], [9].…”

Section: Introductionmentioning

confidence: 99%

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Design of Robust CMOS Amplifiers Combining Advanced Low-Voltage and Feedback Techniques

Abdollahvand

Gomes

Rodrigues

et al. 2012

Technological Innovation for Value Creation

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Abstract. This paper describes and tries to demystify the use of different lowvoltage operation devices, such as dynamic threshold MOS transistors (DTMOS) with feedback techniques such as regulated-feedforward (RFF) and self-biasing (SB). Traditionally, DTMOS devices are only used when nominal supply voltages below 0.7 V are envisaged. Moreover, RFF and SB techniques are normally avoided since engineers designing high-performance amplifiers are afraid of additional stability concerns. This work demonstrates, through exhaustive simulation results over process, temperature and supply (PVT) corners using a standard 130 nm 1.2 V CMOS technology that, employing DTMOS in some specific devices can improve some performance parameters such as the open-loop low-frequency gain and, simultaneously, reduce significantly the variability over PVT corners. Moreover, it is also demonstrated that, there is no risk of operating at supply voltages higher than 1.2 V. Combining DTMOS with RFF and SB allows achieving reasonable gainbandwidth products (GBW) even operating at low-voltage (down to 0.7 V), together averaged power savings of the order of 8% and highly simplifies the design of the circuit (since no biasing circuitry is required).

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Section: Using Regulated-feedforward and Self-biasing Techniquesmentioning

confidence: 99%

Section: Using Regulated-feedforward and Self-biasing Techniquesmentioning

confidence: 99%