±0.25-V Class-AB CMOS Capacitance Multiplier and Precision Rectifiers

Pourashraf, Shirin; Ramírez-Angulo, J.; Hinojo, José María; González-Carvajal, R.; Lopez-Martin, A.J.

doi:10.1109/tvlsi.2018.2881249

Cited by 11 publications

(3 citation statements)

References 35 publications

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“…Further details and examples of pseudo-resistors can be found in [8]. The simplest pseudo-resistor is a diode-connected PMOS transistor operating in deep subthreshold, as shown in Figure 2a [5,35,36]. It is very compact, but the resistance obtained cannot be modified once fabricated, and it is very sensitive to PVT variations.…”

Section: Application Of Qfg Transistors To Energy-efficient Amplifiermentioning

confidence: 99%

“…At the same time, large dynamic currents can be provided, since signals are capacitively coupled to the high impedance gate node. Due to these advantages, QFG transistors have found widespread use in the design of amplifiers but also in high-performance current mirrors [31][32][33][34][35], mixers [36,37], linearization of active resistors [38,39], DC offset cancellation servo loop circuits [40], bootstrapped switches [5], current conveyors [30,[41][42][43], Voltage Feedback Operational Amplifiers (VFOAs) [44], Current Feedback Operational Amplifiers (CFOAs) [45], buffers [46][47][48][49][50][51], rectifiers [35,52], capacitance multipliers [35], transconductors [30,[53][54][55], digital-based analog circuits [56], DC-DC converters [57], continuous-time filters [58][59][60][61], track and hold circuits [5], data converters [5,62], capacitive sensing interfaces [63], particle detectors [23] and retinal prosthesis [64], to name some representative applications.…”

Section: Introductionmentioning

confidence: 99%

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Energy-Efficient Amplifiers Based on Quasi-Floating Gate Techniques

et al. 2021

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Energy efficiency is a key requirement in the design of amplifiers for modern wireless applications. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We illustrate different QFG circuit design techniques aimed to implement low-voltage, energy-efficient class AB amplifiers. A new super class AB QFG amplifier is presented as a design example, including some of the techniques described. The amplifier has been fabricated in a 130 nm CMOS test chip prototype. Measurement results confirm that low-voltage, ultra-low-power amplifiers can be designed, preserving, at the same time, excellent small-signal and large-signal performance.

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Section: Application Of Qfg Transistors To Energy-efficient Amplifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Amplifiers Based on Quasi-Floating Gate Techniques

et al. 2021

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“…A transconductor that is linear over a wide differential input signal range Vd is a key element to implement current-mode and OTA-C systems. Some examples of the utilization of OTAs are: wide-band amplifiers, high frequency gm-C filters [1][2], multipliers [3] and precision rectifiers [4], among many others.…”

Section: Introduction Inear Voltage-to-current Converters (Transcondumentioning

confidence: 99%

360 nW Gate-Driven Ultra-Low Voltage CMOS Linear Transconductor With 1 MHz Bandwidth and Wide Input Range

Rico-Aniles

Ramírez-Angulo

López-Martín

et al. 2020

IEEE Trans. Circuits Syst. II

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A low voltage linear transconductor is introduced. The circuit is a pseudo differential architecture that operates with ±0.2V supplies and uses 900nA total biasing current. It employs a floating battery technique to achieve low voltage operation. The transconductor has a 1MHz bandwidth. It exhibits a SNR = 72dB, SFDR = 42dB and THD = 0.83% for a 100mVpp 10kHz sinusoidal input signal. Moreover, stability is not affected by the capacitance of the signal source. The circuit has been validated with a prototype chip fabricated in a 130nm CMOS technology.

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Enhancement of multiplication factor of capacitor using single current follower differential input transconductance amplifier

Raj,

Shrivastava,

Bhaskar

et al. 2024

Int J Numerical Modelling

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This paper presents a new circuit approach to realize a capacitance multiplier circuit with positive and negative multiplication factors. Based on this approach, two new implementations of positive and negative grounded capacitance multiplier (GCM) circuits are proposed, which utilize only one current follower differential input transconductance amplifier (CFDITA), in conjunction with only one resistor and one virtually grounded capacitor. The presented GCM circuits can enhance a low capacitance value to a very high value (used in low frequency applications), up to 9202 times its original value. An important aspect of the proposed circuits involves designing a lossy parallel inductor circuit by interchanging the passive elements (RC:CR transformation) with each other. The obtained value of the capacitance and inductance can be controlled independently and electronically through the transconductance of CFDITA. The practical usability of the suggested circuits as first and second order filters is discussed. The functionality of the proposed GCM circuits is validated using CMOS CFDITA implemented with 180 nm TSMC technology parameters. Experimental verification of the proposed circuits and application examples is reinforced through the utilization of CFDITA implemented with readily available ICs AD844 and LM13700. These outcomes emphasize the dependability of the suggested circuits.

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±0.25-V Class-AB CMOS Capacitance Multiplier and Precision Rectifiers

Cited by 11 publications

References 35 publications

Energy-Efficient Amplifiers Based on Quasi-Floating Gate Techniques

Energy-Efficient Amplifiers Based on Quasi-Floating Gate Techniques

360 nW Gate-Driven Ultra-Low Voltage CMOS Linear Transconductor With 1 MHz Bandwidth and Wide Input Range

Enhancement of multiplication factor of capacitor using single current follower differential input transconductance amplifier

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