New technique for the offset compensation and noise reduction of MOSFET VLSI operational amplifiers

Shahab, W.; El-Hennawy, A.

doi:10.1080/00207219008921200

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…From these measurements the values of the channel and oxide transconductances g mD , g mox and their dependence on the device biasing conditions and geometry are specified. The drain and gate currents can be formulated by [4][5][6][7] .…”

Section: Experimental and Simulation Resultsmentioning

confidence: 99%

“…Each of these building blocks is constructed as shown in Fig. (3,a,b,) of two input driver MOSFET's T 1 , T′ 1 and T 4 , T′ 4 and two current sources T 2 , T ′ 2 , T 5 , T ′ 5 each pair of driver/source string T 1 , T 2 , T′ 1 , T ′ 2 and T 4 , T 5 , T ′ 4 , T′ 5 are connected in different configuration with a common mode negative feedback through T 3 and T 6 , respectively, to stabilize the currents and node voltages against any device mismatching, characteristics spreading, aging and/or temperature excursions.…”

Section: Architecturementioning

confidence: 99%

“…The need for noise-free operational amplifiers for use in many precision applications has recently been greatly increased [1][2][3] . Numerous studies concerning the specification and evaluation of devices and amplifiers' noise have been developed, in addition to great efforts aiming at compensation or cancellation of this noise [1,3,4,5] .…”

Section: Introductionmentioning

confidence: 99%

“…These contributions showed that the most important noise sources are [1,3,5] : a) the 1/f noise resulting from channel and oxide layer activities and, b) the 4 channel thermal noise. The already-known techniques used to minimize the noise are complicated and considered incapable of efficiently minimizing the noise since these techniques necessitate the employment of an excessive number of devices and circuitries which add to the amplifier noise.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of a New Technique for Adaptive Cancellation of Noise in MOSFET Op. Amps.

El-Hennawy¹,

Alharbi²,

Banah³

1999

eng

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The paper presents a new technique for adaptive cancellation of noise in MOSFET IC operational amplifiers. It employs two operational amplifiers, one is passive with its inverting and noninverting inputs short circuited. This operational amplifier is only responsible to amplify its equivalent input noise and to give a proportional output voltage. The second operational amplifier is active and is used to amplify the signal to be processed together with its equivalent input noise and gives, thus, a proportional output voltage. The two operational amplifiers are coupled to each other through a common floating gate so that the noise of the passive amplifier is subtracted from the input of the second one and makes it, therefore, noise-free (~lnV/√  Hz or 0.1 µV rms within 2.5 kHz bandwidth) over a wide variety dynamic range of input voltage (~120 dB) and ambient temperature. A feedback loop is added to improve the amplifier linearity (better than 2%). The standard 2 µm CMOS technology is used for the realization of the proposed noise-free operational amplifier.

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Section: Experimental and Simulation Resultsmentioning

confidence: 99%

Section: Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of a New Technique for Adaptive Cancellation of Noise in MOSFET Op. Amps.

El-Hennawy¹,

Alharbi²,

Banah³

1999

eng

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show abstract

“…Among them, some commonly used methods such as using the hot electron to modify the threshold voltages of input devices [3] need a special fabrication process, which may not be feasible in a standard process; and others as like using digital technology to implement automatic offset canceling [4] will occupy a large die area for incorporating active memory device.…”

Section: Offset Canceling Circuitmentioning

confidence: 99%

A high gain low offset amplifier with rail-to-rail inputs

Zhang

Wu²,

Xiaolang³

2005 IEEE Conference on Electron Devices and Solid-State Circuits

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To fit some applications like in Power Management IC (Integrated Circuit), ahigh gain low offset BiCMOS op amp was proposed in this paper. A complementary input stage was adopted to meet a rail-to-rail ICMR (input Common-Mode Range). And a special circuit configuration was introduced into the rail-to-rail amplifier to keep its gain constant. Simulation showed that the variation of gm was maintained within 2% over the whole input range. Meanwhile, by using bipolar input stage and current compensating circuit, the offset voltage of the op amp iis reduced to less than 0.5mV. originated from channel length modulation, especially Fig.1 Typical current sensing application

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Threshold-voltage instability caused by the hot-carrier substrate current in MOSFETs

El-Hennawy

Al-Barakati

Alharbi

1993

International Journal of Electronics

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New technique for the offset compensation and noise reduction of MOSFET VLSI operational amplifiers

Cited by 11 publications

References 2 publications

Investigation of a New Technique for Adaptive Cancellation of Noise in MOSFET Op. Amps.

Investigation of a New Technique for Adaptive Cancellation of Noise in MOSFET Op. Amps.

A high gain low offset amplifier with rail-to-rail inputs

Threshold-voltage instability caused by the hot-carrier substrate current in MOSFETs

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