What's All This VBE Stuff, Anyhow?

Pease, Robert A.

doi:10.1016/b978-0-7506-8627-3.00017-0

Cited by 7 publications

(7 citation statements)

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“…The input capacitance of an op-amp can cause instability when op amp is used with feedback resistor. Therefore, the feedback capacitance will make it stable [11]. The instability will cause a noise, therefore it is considered as filtering when this connection is established.…”

Section: Oko =Qüé=`çåëíêìåíáçå=çñ=oéåéáîéê=`áêåìáí= =mentioning

confidence: 99%

Front End Development Of Optical Tomography And Its Linearity

Muji¹,

Yunos²,

Rahim³

et al. 2012

Jurnal Teknologi

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Pembangunan bahagian hadapan adalah penting di dalam tomografi optikal. Ia memberikan pandangan pertama tentang bagaimana kebolehpercayaan sistem tomografi kepada pengukurannya. Oleh itu, litar penghantar dan penerima mesti dibina berhati-hati dengan analisis yang baik untuk setiap pemilihan unit komponennya. Kertas kerja ini akan menunjukkan kesan pembangunan litar kepada mutu kelinearannya. Tujuan kertas kerja ini adalah untuk membina litar penghantar dan penerima untuk aplikasi tomografi optikal. Ia dilakukan dengan mendapatkan unit voltan pada bahagian penerima setelah bertindak balas terhadap kewujudan penghalang yang mengganggu laluan cahaya di antara penghantar dan penerima. Reka bentuk eksperimen ini menggunakan penghalang dari jenis yang sama dengan perbezaan saiz di antara 0.5 hingga 3 mm. Daripada keputusan ia menunjukkan lebih besar objek, nilai bagi kehilangan voltan juga akan meningkat. Ini menunjukkan hubungan yang linear di antara kedua-dua parameter. Kata kunci: Tomografi optikal penghantar; penerima; litar; kelinearan Front end development is crucial in optical tomography. It gives the first impression on how reliable the tomography system towards its measurement. Therefore, transmitter and receiver circuit must be developed carefully with good analysis for each selection of the component units. This paper will show the effect of circuit development towards linearity performance. The aim of this paper is to construct a transmitter and receiver circuit for optical tomography application. This is done by capturing a voltage unit at the receiver side in response to the existence of obstacle that interrupt the light path between transmitter and receiver. The experiment design uses a same type of obstacle with different sizes between 0.5 until 3mm. From the result it shows the bigger the object the voltage loss value also increasing. This shows a linear relation between both parameters. Key words: Optical tomography; transmitter; receiver; circuit; linearity

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Section: Oko =Qüé=`çåëíêìåíáçå=çñ=oéåéáîéê=`áêåìáí= =mentioning

confidence: 99%

Front End Development Of Optical Tomography And Its Linearity

Muji¹,

Yunos²,

Rahim³

et al. 2012

Jurnal Teknologi

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“…Ref. [3] gives a simple and effective realization of the idea; Refs. [4], [5], [6] describe metrology-grade realizations.…”

Section: Introductionmentioning

confidence: 99%

A Current Source for Picoamperemeter Calibration

Callegaro

D'Elia

Trinchera

2006

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings

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A traceable current source for the calibration of lowcurrent meters (picoamperemeters, electrometers) in the 100 fA-100 pA current range is here presented. It is based on a lowfrequency trapezoidal wave generator, measured with a sampling voltmeter, which charges and discharges a gas-dielectric capacitor. The generated current is traceable to units of voltage, capacitance and time. The source will be employed to extend in the lower range the Italian national standard of dc current, and for the Italian participation in the EUROMET.EM-S24 international intercomparison. Being simple and inexpensive, the source can find application in secondary calibration laboratories.

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“…Available commercial standard capacitors range from 1 pF to 10 nF 1 . However, capacitances above 1 nF are likely to cause oscillations in the input stage of the instrument being calibrated [10] and therefore cannot be employed.…”

Section: Introductionmentioning

confidence: 99%

Generation of Reference DC Currents at 1 nA Level With the Capacitance-Charging Method

Callegaro

Capra

D'Elia

et al. 2014

IEEE Trans. Instrum. Meas.

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The capacitance-charging method is a wellestablished and handy technique for the generation of dc current in the 100 pA range or lower. This method involves a capacitance standard and a sampling voltmeter, highly stable devices easy to calibrate, and it is robust and insensitive to the voltage burden of the instrument being calibrated. In this paper, we propose a range extender amplifier, which can be employed as a plug-in component in existing calibration setups, and allows the generation of currents in the 1 nA range. The extender has been employed in the Istituto Nazionale di Ricerca Metrologica setup and validated with two comparisons at 100 pA and 1 nA current levels. The calibration accuracy achieved on a top-class instrument is 5 × 10 −5 at 1 nA.

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What's All This VBE Stuff, Anyhow?

Cited by 7 publications

References 0 publications

Front End Development Of Optical Tomography And Its Linearity

Front End Development Of Optical Tomography And Its Linearity

A Current Source for Picoamperemeter Calibration

Generation of Reference DC Currents at 1 nA Level With the Capacitance-Charging Method

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