Hamon 10×100MΩ resistor based traceable source for calibration of picoammeters in the range 100pA–100nA

Galliana, Flavio; Capra, Pier Paolo

doi:10.1016/j.measurement.2010.07.006

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…The comparison at ±1 nA involves the capacitance-charging source (including E) and a standard calibration setup based on the Ohm's law method. The setup for Ohm's law method is based on a high-valued resistor R and a calibrated dc voltage source V and similar to that described in [18], [19].…”

Section: B Comparison At 1 Na Versus Ohm's Law Methodsmentioning

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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Section: B Comparison At 1 Na Versus Ohm's Law Methodsmentioning

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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“…This factor causes the amplifier to have a complicated frequency characteristic, which results in its poor responses [1] [2]. Some shielding techniques [3]- [5] have been reported for the purpose of de-creasing these capacitive components. In spite of the fact that these methods have been employed, it is difficult to realize drastic improvements of the response speeds of the very low level dc current amplifier.…”

Section: Introductionmentioning

confidence: 99%

A Very Low Level dc Current Amplifier Using SC Circuit: Effects of Parasitic Capacitances and Duty Ratio on Its Output

Higa¹,

Onaga²,

Nakamura³

2014

OJAppS

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This paper describes a very low level dc current amplifier using switched capacitor (SC) circuit to miniaturize and improve its output response speed, instead of the conventionally used high-ohmage resistor. A switched capacitor filter (SCF) and an offset controller are also used to decrease vibrations and offset voltage at the output of the amplifier. The simulation results show that the parasitic capacitances that are distributed to the input portion of the amplifier have some effect on offset voltage. From the experimental results, it is seen that the duty ratio of the clock cycle of SC circuit should be in the range from 0.05 to 0.70. It is suggested that the proposed very low level dc current amplifier using SC circuit is an effective way to obtain both a faster output response and its miniaturization.

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“…This factor causes the amplifier to have a complicated frequency characteristic, which results in poor responses of the very low level dc current amplifier [1][2][3]. Some shielding techniques [4][5][6] have been reported for the purpose of decreasing these capacitive components. In spite of the fact that these methods have been employed, it was difficult to realize drastic improvements of the response speeds of the very low level dc current amplifier.…”

Section: Introductionmentioning

confidence: 99%

Design of a Switched Capacitor Negative Feedback Circuit for a Very Low Level DC Current Amplifier

Higa

Nakamura²

2013

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To miniaturize a very low level dc current amplifier and to improve its output response speed, the switched capacitor negative feedback circuit (SCNF), instead of the conventionally used high-ohmage resistor, is presented in this paper. In our system, a switched capacitor filter (SCF) and an offset controller are also used to decrease vibrations and offset voltage at the output of the amplifier using SCNF. The theoretical output voltage of the very low level dc current amplifier using SCNF is obtained. The experimental results show that the unnecessary components of the amplifier’s output are much decreased, and that the response speed of the amplifier with both the SCNF and SCF is faster than that using high-ohmage resistor.

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Hamon 10×100MΩ resistor based traceable source for calibration of picoammeters in the range 100pA–100nA

Cited by 5 publications

References 7 publications

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

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

A Very Low Level dc Current Amplifier Using SC Circuit: Effects of Parasitic Capacitances and Duty Ratio on Its Output

Design of a Switched Capacitor Negative Feedback Circuit for a Very Low Level DC Current Amplifier

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