scholarly journals A low-noise high dynamic-range time-domain EMI measurement system for CISPR Band E

2011 ◽  
Vol 9 ◽  
pp. 309-315
Author(s):  
C. Hoffmann ◽  
P. Russer
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Time Domain ◽  
Dynamic Range ◽  
Digital Signal ◽  
High Dynamic Range ◽  
Low Noise ◽  
Noise Floor ◽  
Multi Stage ◽  
Analog To Digital Conversion

Abstract. In this paper, a broadband time-domain EMI measurement system for measurements from 9 kHz to 18 GHz is presented that allows for compliant EMI measurements in CISPR Band E. Combining ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion, scan times can be reduced by several orders of magnitude in comparison to a traditional heterodyne EMI-receiver. The ultra-low system noise floor of 6–8 dB and the real-time spectrogram allow for the characterisation of the time-behaviour of EMI near the noise floor. EMI measurements of electronic consumer devices and electric household appliances are presented.

scholarly journals Measurement of electromagnetic interference in time-domain

2008 ◽  
Vol 6 ◽  
pp. 311-313 ◽  
Author(s):  
S. Braun ◽  
A. Frech ◽  
P. Russer
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Time Domain ◽  
Electromagnetic Interference ◽  
Dynamic Range ◽  
Operating Time ◽  
Low Noise ◽  
Measurement Time ◽  
Noise Power ◽  
Processing Unit

Abstract. Time-domain EMI measurement systems allow measurement time to be reduced by several orders of magnitude. In this paper a novel real-time operating time-domain EMI measurement system is presented. By the use of several analog-to-digital converters the dynamic range requested by the international EMC standards is achieved. A real-time operating digital signal processing unit is presented. The frequency band that is investigated is subdivided into several sub-bands. A novel implementation of the 9 kHz IF filter for the frequency 150 kHz to 1 GHz is presented. By this way the measurement time has been reduced by a factor of 8000 in comparison to conventional EMI receivers. During emission measurements performed with a modelled IF-bandwidth of 9 kHz the noise floor is decreased to −19 dBµV in the average detector mode by the implemented low noise power splitter. Measurements have been performed with the improved measurement system in the frequency range 30 MHz–1 GHz.

scholarly journals The Isotopx NGX and the ATONA Faraday Amplifiers

2020 ◽  
Author(s):  
Stephen E. Cox ◽  
Sidney R. Hemming ◽  
Damian Tootell
Keyword(s):  
Mass Spectrometer ◽  
Dynamic Range ◽  
Noble Gas ◽  
High Dynamic Range ◽  
High Gain ◽  
Low Noise ◽  
Transimpedance Amplifier ◽  
Noise Floor ◽  
Baseline Noise ◽  
Noise Measurements

Abstract. We installed the new Isotopx ATONA Faraday cup detector amplifiers on an Isotopx NGX mass spectrometer at Lamont-Doherty Earth Observatory in early 2018. The ATONA is a capacitive transimpedance amplifier, which differs from the traditional resistive transimpedance amplifier used on most Faraday detectors for mass spectrometry. Instead of a high gain resistor, a capacitor is used to accumulate and measure charge. The advantages of this architecture are a very low noise floor, rapid response time, stable baselines, and very high dynamic range. We show baseline noise measurements and measurements of argon from air and cocktail gas standards to demonstrate the capabilities of these amplifiers. The ATONA exhibits a noise floor better than a traditional 1013 Ω amplifier in normal noble gas mass spectrometer usage, superior gain and baseline stability, and an unrivaled dynamic range that makes it practical to measure beams ranging in size from below 10−16 A to above 10−9 A using a single amplifier.

scholarly journals High dynamic range, Interferences Tolerant, Digital Receivers for Radioastronomy: Results and Projects at Paris and Nanay Observatory

2002 ◽  
Vol 199 ◽  
pp. 506-507
Author(s):  
Carlo Rosolen ◽  
Alain Lecacheux ◽  
Eric Gerard ◽  
Vincent Clerc ◽  
Laurent Denis
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
Block Diagram ◽  
Low Frequency ◽  
Parallel Architecture ◽  
Digital Signal ◽  
High Dynamic Range ◽  
Dsp System ◽  
High Dynamic ◽  
Digital Receivers

Radio astronomy in the decameter to centimeter wavelength range is facing new challenges because of man made interferences due to increasing needs in telecommunications. At the Radioastronomy department of Paris Meudon Observatory, we have been working since four years on high dynamic range digital receivers based on Digital Signal Processors (DSP). The first achievement is a digital spectro- polarimeter devoted to spectroscopy of astrophysical radiation in decameter range, now in operation at the Nancay Decameter array. The block diagram of the receiver includes a high dynamic range analogue section followed by a 12 bits analogue to digital converter. The digital part makes use of high power, programmable digital circuits for signal processing, arranged in a dedicated parallel architecture, able to compute in real time the power spectrum and the correlation of the input signals. This receiver was also used, as spectrometer backend, at Nancay decimetric radiotelescope and has performed very well in the presence of very strong interferences. We are presently working on a new digital receiver with broader bandwidth. The objective is 2 × 25 MHz band with at least 60 dB dynamic range. This new receiver will use additional computation power in order to recognise and avoid man made interferences which corrupt the radio astronomical signal. At the Nancay Radioastronomy Observatory, we have started to develop a new digital configurable receiver with 8 times 25 MHz band and ten thousand channels. For low frequency radioastronomy, direct spectrum computation technique is really powerful and offers new capabilities for real time interferences excision. Fig. 1 shows pulsar observations in the presence of interference made with the DSP receiver on the UTR-2 radiotelescope. Fig. 2 shows the effect of satellite interfernce on OH observations made with the Nancay telescope. Fig. 3 shows the block diagram of the DSP system and demonstrates how offline excision of interference in the frequency time-domain enables recovery of the signal. The final spectrum had 960 minutes integration on and off source and took 8045 minutes of procession on a 450 MHz Pentium II.

scholarly journals The Isotopx NGX and ATONA Faraday amplifiers

Geochronology ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 231-243
Author(s):  
Stephen E. Cox ◽  
Sidney R. Hemming ◽  
Damian Tootell
Keyword(s):  
Mass Spectrometer ◽  
Dynamic Range ◽  
Noble Gas ◽  
High Dynamic Range ◽  
High Gain ◽  
Low Noise ◽  
Transimpedance Amplifier ◽  
Noise Floor ◽  
Baseline Noise ◽  
Noise Measurements

Abstract. We installed the new Isotopx ATONA Faraday cup detector amplifiers on an Isotopx NGX mass spectrometer at Lamont-Doherty Earth Observatory in early 2018. The ATONA is a capacitive transimpedance amplifier, which differs from the traditional resistive transimpedance amplifier used on most Faraday detectors for mass spectrometry. Instead of a high-gain resistor, a capacitor is used to accumulate and measure charge. The advantages of this architecture are a very low noise floor, rapid response time, stable baselines, and very high dynamic range. We show baseline noise measurements and measurements of argon from air and cocktail gas standards to demonstrate the capabilities of these amplifiers. The ATONA exhibits a noise floor better than a traditional 1013 Ω amplifier in normal noble gas mass spectrometer usage, superior gain and baseline stability, and an unrivaled dynamic range that makes it practical to measure beams ranging in size from below 10−16 to above 10−9 A using a single amplifier.

High-dynamic-range low-noise microwave amplifier

1970 ◽  
Vol 6 (7) ◽  
pp. 202
Author(s):  
J.R. Collard ◽  
A.R. Gobat
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Low Noise ◽  
Microwave Amplifier ◽  
High Dynamic

scholarly journals NULL Convention Floating Point Multiplier

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Anitha Juliette Albert ◽  
Seshasayanan Ramachandran
Keyword(s):  
High Precision ◽  
Dynamic Range ◽  
Digital Signal ◽  
High Dynamic Range ◽  
Floating Point ◽  
Single Precision ◽  
Critical Part ◽  
Point Multiplication ◽  
Null Convention Logic ◽  
High Dynamic

Floating point multiplication is a critical part in high dynamic range and computational intensive digital signal processing applications which require high precision and low power. This paper presents the design of an IEEE 754 single precision floating point multiplier using asynchronous NULL convention logic paradigm. Rounding has not been implemented to suit high precision applications. The novelty of the research is that it is the first ever NULL convention logic multiplier, designed to perform floating point multiplication. The proposed multiplier offers substantial decrease in power consumption when compared with its synchronous version. Performance attributes of the NULL convention logic floating point multiplier, obtained from Xilinx simulation and Cadence, are compared with its equivalent synchronous implementation.

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