Gain and bandwidth boosting techniques for high-speed operational amplifiers

Amourah, M.M.; Geiger, R.L.

doi:10.1109/iscas.2001.921833

Cited by 22 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the positive feedback approach, the transconductance is increased with no more energy consumption. In addition, the positive feedback can be used for increasing the output impedance, which leads to a higher DC gain [24][25][26]. In the present study, we use a two-stage chopper modulated recycling amplifier, which its first stage without a chopper circuit has been presented in [27].…”

Section: Proposed Two-stage Chopper Modulated Rfc Amplifiermentioning

confidence: 99%

Designing a Low-Power LNA and Filter for Portable EEG Acquisition Applications

2021

View full text Add to dashboard Cite

A circuit with a low-power low-noise amplifier and a Gm-C ultra-low-power filter is proposed in this paper for portable electroencephalogram (EEG) acquisition applications. The proposed circuit contains a two-stage chopper-stabilized fully recycling folded cascode (TSRFC) amplifier and a second-order continuous-time Gm-C low pass filter (LPF) with ultra-low-power consumption. The noise and input offset are reduced using the chopper-stabilized technique. A two-stage amplifier that consists of composite transistors and a recycling structure is proposed for the amplifier. Compared to a typical folded cascode CMOS amplifier, the proposed design has higher DC gain and slew rate as well as lower input-referred noise. This circuit has an adjustable second-order Gm-C LPF with very low power consumption. The amplifier achieves a midband gain of 70 dB and a -3dB bandwidth in the range 0.1-212 Hz. Moreover, the amplifier is designed in 0.18-µm CMOS process and the chip area of the proposed circuit with pads is 450×450 μm 2 . The adjustable LPF has a 100 Hz cut-off frequency. The proposed circuit has an input-referred noise of 0.7 μVrms, (0.1~100Hz) and a power consumption of 380 nW at 1 V supply.INDEX TERMS Fully recycling folded cascode amplifier, chopper-stabilized technique, EEG, Gm-C filter, low-noise design.

show abstract

Section: Proposed Two-stage Chopper Modulated Rfc Amplifiermentioning

confidence: 99%

Designing a Low-Power LNA and Filter for Portable EEG Acquisition Applications

2021

View full text Add to dashboard Cite

show abstract

“…Because the large bandwidth and gain of the proposed version 1 of V-I converter, it is possible to use this approach for Operational amplifier [9,10]. The Figure 13 shows a practical implementation of the two-stage Operational amplifier.…”

Section: Application Of V-i Converter In Two-stage Operational Amplifiermentioning

confidence: 99%

High-Performance CMOS Current Mirrors: Application to Linear Voltage-to-Current Converter Used for Two-Stage Operational Amplifier

Laajimi¹,

Masmoudi²

2012

View full text Add to dashboard Cite

This paper presents two schemes of high performance CMOS current mirror, one of them is used for operational tran-sconductance amplifier (OTA) in analog VLSI systems. The linearity, output impedance, bandwidth and accuracy are the most parameters to determine the performance of the current mirror. Here a comparison of two architectures based on same architecture of the amplifier is presented. This comparison includes: linearity, output impedance, bandwidth and accuracy. These two circuits are validated with simulation in technology AMS 0.35 μm. An operational amplifier based on the adapted current mirror is proposed. Its frequency analysis with large bandwidth is validated with the same technology

show abstract

“…Many design techniques of the analog amplifiers [1]- [5] have been addressed in the literature so far. A design method, dynamic biasing (output impedance enhancement) technique [1], enhances the DC gain but reduces the settling of output [2]. The positive feedback technique [2], [3] also improves the DC gain without limiting its highfrequency performance, but here transistor matching is the Manuscript received 3 October, 2020.…”

Section: Introductionmentioning

confidence: 99%

“…A design method, dynamic biasing (output impedance enhancement) technique [1], enhances the DC gain but reduces the settling of output [2]. The positive feedback technique [2], [3] also improves the DC gain without limiting its highfrequency performance, but here transistor matching is the Manuscript received 3 October, 2020. Received in revised form 25 November, 2020 and 12 December, 2020.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of the UTBSOI Transistor based Two-Stage Operational Amplifiers

Ahmed¹,

Vijaykumar²,

Saha³

2020

ELS

View full text Add to dashboard Cite

In the nanoscale domain, the MOSFETs are prone to various physical effects due to their shorter channel region known as short-channel effects (SCE). The researchers have proposed an advanced structure of MOSFET known as the ultrathinbody silicon-on-insulator (UTBSOI) to overcome the limitations of SCEs. The UTBSOI is a type of double-gate (DG) MOSFET having superior controllability of gates over the shorter channel region. Nowadays, the UTBSOI MOSFETs can be adopted in the circuit simulators through the use of a device model named BSIM-IMG. The BSIM-IMG has made it possible for the circuit designers to simulate any UTBSOI based analog blocks like operational amplifiers (opamp). The performance parameters of an opamp are very much sensitive to any perturbation in size (W/L) of the constituent MOSFETs, that may cause a drastic change in the output. In this paper, the sensitivity analysis procedure has been proposed for the CMOS and UTBSOI based two-stage opamps as the function of perturbation in W/L. In addition to this, an algorithm has also been presented to do the same. From the simulation results, it is observed that the sensitivity of the UTBSOI based opamp (UTBSOI-opamp) is larger than that of CMOS based opamp (CMOS-opamp).

show abstract

Gain and bandwidth boosting techniques for high-speed operational amplifiers

Cited by 22 publications

References 6 publications

Designing a Low-Power LNA and Filter for Portable EEG Acquisition Applications

Designing a Low-Power LNA and Filter for Portable EEG Acquisition Applications

High-Performance CMOS Current Mirrors: Application to Linear Voltage-to-Current Converter Used for Two-Stage Operational Amplifier

Sensitivity Analysis of the UTBSOI Transistor based Two-Stage Operational Amplifiers

Contact Info

Product

Resources

About