Power-efficient class AB CMOS buffer

Lopez-Martin, A.J.; Ramírez-Angulo, J.; Carvajal, R.G.; Acosta, Lucía

doi:10.1049/el:20092270

Cited by 33 publications

(28 citation statements)

References 4 publications

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“…Their power consumption is really very low (µWatts) [24][25][26] and they are also very simple in many cases [25][26][27]. Similarly to our solution, circuits in [24][25][26][27] do not require differential transconductance sections with tail current sources.…”

Section: Comparison Of Simulation Results With Hitherto Published Solmentioning

confidence: 91%

“…The second group is focused on voltage followers [24][25][26][27] with unity gain. Their power consumption is really very low (µWatts) [24][25][26] and they are also very simple in many cases [25][26][27].…”

Section: Comparison Of Simulation Results With Hitherto Published Solmentioning

confidence: 99%

“…We also studied several hitherto published solutions [18][19][20][21][22][23][24][25][26][27][28][29] of the VGAs and simple CMOS amplifiers. The main attributes of these solutions are focused on wide-range gain control (± 40 dB) and they usually require many bias sources ( [18], [19], [22], [23], for example).…”

Section: Introductionmentioning

confidence: 99%

“…The main attributes of these solutions are focused on wide-range gain control (± 40 dB) and they usually require many bias sources ( [18], [19], [22], [23], for example). Many of the known structures are based on specific utilizations of the differential (transconductance) sections [18][19][20][21][22][23], [28], [29] but some circuits also operate without a differential section [24][25][26][27]. Moreover, many of the previously introduced structures use biasing current sources not only for biasing of the transconductance sections, for example [24], [25], [27].…”

Section: Introductionmentioning

confidence: 99%

“…Many of the known structures are based on specific utilizations of the differential (transconductance) sections [18][19][20][21][22][23], [28], [29] but some circuits also operate without a differential section [24][25][26][27]. Moreover, many of the previously introduced structures use biasing current sources not only for biasing of the transconductance sections, for example [24], [25], [27]. The bias source of the transconductance section [18][19][20][21][22][23], [28], [29] is necessary for g m adjusting.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop

Šotner

Jeřábek

Herencsár

et al. 2015

Measurement Science Review

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Section: Comparison Of Simulation Results With Hitherto Published Solmentioning

confidence: 91%

Section: Comparison Of Simulation Results With Hitherto Published Solmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop

Šotner

Jeřábek

Herencsár

et al. 2015

Measurement Science Review

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An ultra‐low‐power, low‐noise tunable electrocardiogram amplifier

Saeidian

Ashraf

2020

Circuit Theory & Apps

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Summary The objective of this research work is to propose an innovative low‐power, low‐noise, tunable three‐stage capacitive instrumentation amplifier, capable of receiving and magnifying the electrocardiogram (ECG) signals. This is done by adding an extra stage to the second stage of the conventional capacitive instrumentation amplifier. The results show similar midband gain with lesser capacitor usage and smaller chip occupancy area with provision of concurrent tunable gain and bandwidth. The proposed amplifier is designed and implemented using TSMC 0.18‐μm CMOS technology scale under a 1‐V supply voltage with the simulation process carried out using Cadence Virtuoso tool. Post‐layout simulation results show that the amplifier has a tunable midband gain of 55 to 65.6 dB, low‐cutoff frequency tuned from 377 mHz to 4.5 Hz and high‐cutoff frequency tuned from 86.8 to 263.6 Hz. The simulated value of the input‐referred noise and noise efficiency factor (NEF) of the amplifier are 9.6 μVrms and 6.1, respectively, with the total power consumption of 71.2 nW.

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Power‐efficient analog design based on the class AB super source follower

Lopez-Martin

Acosta

Garcia-Alberdi

et al. 2011

Circuit Theory & Apps

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SUMMARYA class AB version of the conventional super source follower (SSF) is described. The circuit greatly increases slew rate (SR) and current efficiency, maintaining the low distortion and low output resistance of the SSF. Class AB operation is achieved without extra power dissipation or supply requirements, and without bandwidth or noise degradation. The circuit can advantageously replace the SSF in a wide variety of analog systems, opening a new research line in analog design. To illustrate the widespread application of this cell, a class AB differential unity-gain buffer, a class AB differential current mirror and two class AB differential transconductors are designed, fabricated in a 0.5 m CMOS technology and tested. Measurement results using a dual supply of ±1.65 V show that the proposed class AB version of the SSF improves SR by a factor 21.5 and increases bandwidth by 10%, keeping noise level, input range, power consumption, and supply requirements unaltered. The fabricated class AB current mirror features a THD at 100 kHz of −62 dB for signal currents 20 times larger than the bias current. The fabricated transconductors feature an IM3 at 1 MHz of −56.6 dB for output currents more than 13 times larger than the bias currents.

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Power-efficient class AB CMOS buffer

Cited by 33 publications

References 4 publications

Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop

Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop

An ultra‐low‐power, low‐noise tunable electrocardiogram amplifier

Power‐efficient analog design based on the class AB super source follower

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