Very simple FET amplifier with a voltage noise floor less than 1 nV/sqrt(Hz)

Callegaro, Luca; Pisani, Marco; Pollarolo, Alessio

doi:10.48550/arxiv.0811.2866

Cited by 3 publications

(7 citation statements)

References 4 publications

(4 reference statements)

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“…As an example of results, the following refers to a continuous acquisition run (the parameters of the acquisition are n = 1200 cycles, each of 2 17 points at 200 kHz sampling frequency, m N = 200, m C = 50, B = 3 kHz to 7 kHz; the calibration signal has a length of 2 16 codes with 500 kHz sampling rate). Total measurement time is 2.3 × 10 5 s (about 2.7 days).…”

Section: Resultsmentioning

confidence: 99%

“…Amplifiers A are identical; each one is composed of two stages, giving an overall gain of ≈31 000. The first stage (see [16] for details) is a pseudo-differential, cascode FET amplifier in an open-loop configuration [11]. Its equivalent input voltage noise is ≈0.8 nV Hz −1/2 , and the bias current is 2 pA to 3 pA; the gain flatness is better than 1 dB over 1 MHz bandwidth.…”

Section: Amplifiersmentioning

confidence: 99%

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A Johnson noise thermometer with traceability to electrical standards

Callegaro¹,

D'Elia²,

Pisani³

et al. 2009

Metrologia

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The paper presents an absolute Johnson noise thermometer (JNT), an instrument to measure the thermodynamic temperature of a sensing resistor, with traceability to voltage, resistance and frequency quantities. The temperature is measured in energy units, and can be converted to SI units (kelvin) with the accepted value of the Boltzmann constant kB; or, conversely, it can be employed to perform measurements at the triple point of water and obtain a determination of kB. The thermometer is composed of a correlation spectrum analyzer and a calibrator. The calibrator generates a pseudorandom noise (at a level suitable for traceability to an ac voltage standard) by digital synthesis, scaled in amplitude by a chain of electromagnetic voltage dividers and cyclically injected in series with the Johnson noise. First JNT measurements at room temperature are compatible with those of a standard platinum resistance thermometer within the estimated combined uncertainty of 60 µK K−1 of both instruments. A path towards future improvements of JNT accuracy is also sketched.

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Section: Resultsmentioning

confidence: 99%

Section: Amplifiersmentioning

confidence: 99%

A Johnson noise thermometer with traceability to electrical standards

Callegaro¹,

D'Elia²,

Pisani³

et al. 2009

Metrologia

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“…Figure 52 shows a PA with a cascade FET transistor circuit designed for low capacitance and resistance photodetector. The transistor is in a common-source configuration [146]. This circuit eliminates the Miller effect, thus enhancing the bandwidth.…”

Section: Complex Pasmentioning

confidence: 99%

“…The overall low-frequency gain of the PA depends on feedback resistance and FET transconductance. Using an LSK 170B transistor, a low-noise voltage of 0.9 nV/Hz 1/2 was obtained [146]. To provide a wider bandwidth with unity voltage gain, it is possible to apply a source follower configuration.…”

Section: Complex Pasmentioning

confidence: 99%

Recent advances in manufacturing of miniaturized uncooled IR detection modules

Kalinowski

Mikołajczyk

Piotrowski

et al. 2019

Semicond. Sci. Technol.

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This paper reports on recent progress in infrared detection modules that integrate infrared photodetectors, signal processing electronics, optics, heat dissipation systems, and other components in common packages. The integration makes detectors less vulnerable to over-bias, electrostatic discharges, electromagnetic interferences, and other environmental exposures. Additional advantages of integration are improved HF performance, output signal standardization, miniaturization, and cost reduction. Examples are given of detection modules with an infrared detector optimized for uncooled or Peltier-cooled operation in the spectral range of 2 to 16 μm. The paper is mainly based on the authors' experience in the development and fabrication of detection modules at Vigo System S.A.

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“…YBRID topologies composed of discrete Junction Field Transistors (JFETs) and Operational Amplifiers (OAs) provide a simple way to implement front ends featuring both low voltage noise and low current noise, and which are able to work properly with a wide range of signal source impedances [1,2,3,4,5]. The key to this approach is that the JFET provides a low-noise front end with a gain of typically 20-30 times, thus relaxing the noise requirements for the next stage and allowing its implementation with OAs.…”

Section: Introductionmentioning

confidence: 99%

A hybrid amplifier topology for low‐noise direct‐coupled front ends

Spinelli,

Haberman,

Guerrero

2024

Circuit Theory & Apps

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SummaryHybrid amplifiers combine discrete transistors with operational amplifiers (OAs) achieving superior characteristics compared with commercially available OAs, while keeping simple structures and a reduced number of parts. A single‐ended amplifier topology based on a junction field‐effect transistor (JFET) is proposed as a means of achieving very low input noise levels, both in current and voltage. It is direct‐coupled and allows to place a high‐pass filter at its input to preserve input range, or at its output to optimize noise. The proposed topology results in a low input capacitance and low input‐current noise, making it suitable for applications where multiple amplifiers are connected in parallel to achieve ultra‐low noise levels. The amplifier's gain is set by a resistor ratio, being suitable for instrumentation front ends. The circuit analysis and design equations are provided to adapt it for different applications and, as an example, an amplifier with a gain of 40 dB and a bandwidth from DC to 1 MHz was designed, built, and tested. The dominant noise contribution of the amplifier was the JFET (a JFE2140 device), featuring an input noise voltage of , that is reduced to when two amplifiers are connected in parallel.

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Very simple FET amplifier with a voltage noise floor less than 1 nV/sqrt(Hz)

Cited by 3 publications

References 4 publications

A Johnson noise thermometer with traceability to electrical standards

A Johnson noise thermometer with traceability to electrical standards

Recent advances in manufacturing of miniaturized uncooled IR detection modules

A hybrid amplifier topology for low‐noise direct‐coupled front ends

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