equivalent noise temperature

A New Method to Obtain Total Power Receiver Equivalent Noise Temperature

33rd European Microwave Conference, 2003 ◽

10.1109/euma.2003.340963 ◽

2003 ◽

Cited By ~ 2

Author(s):

Beatriz Aja ◽

Juan Pablo Pascual ◽

Luisa de la Fuente ◽

Julio Gallegos ◽

Eduardo Artal

Keyword(s):

Noise Temperature ◽

New Method ◽

Total Power ◽

Equivalent Noise Temperature

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Measuring Noise Temperatures of Phased-Array Antennas for Astronomy at CSIRO

Publications of the Astronomical Society of Australia ◽

10.1017/pasa.2014.11 ◽

2014 ◽

Vol 31 ◽

Cited By ~ 11

Author(s):

A. P. Chippendale ◽

D. B. Hayman ◽

S. G. Hay

Keyword(s):

Phased Array ◽

Signal To Noise Ratio ◽

Noise Temperature ◽

Broadband Noise ◽

Systematic Effect ◽

Antenna Measurement ◽

Detailed Model ◽

Phased Array Antennas ◽

Array Antennas ◽

Equivalent Noise Temperature

AbstractWe describe the development of a noise-temperature testing capability for phased-array antennas operating in receive mode from 0.7 GHz to 1.8 GHz. Sampled voltages from each array port were recorded digitally as the zenith-pointing array under test was presented with three scenes: (1) a large microwave absorber at ambient temperature, (2) the unobstructed radio sky, and (3) broadband noise transmitted from a reference antenna centred over and pointed at the array under test. The recorded voltages were processed in software to calculate the beam equivalent noise temperature for a maximum signal-to-noise ratio beam steered at the zenith. We introduced the reference-antenna measurement to make noise measurements with reproducible, well-defined beams directed at the zenith and thereby at the centre of the absorber target. We applied a detailed model of cosmic and atmospheric contributions to the radio sky emission that we used as a noise-temperature reference. We also present a comprehensive analysis of measurement uncertainty including random and systematic effects. The key systematic effect was due to uncertainty in the beamformed antenna pattern and how efficiently it illuminates the absorber load. We achieved a combined uncertainty as low as 4 K for a 40 K measurement of beam equivalent noise temperature. The measurement and analysis techniques described in this paper were pursued to support noise-performance verification of prototype phased-array feeds for the Australian Square Kilometre Array Pathfinder telescope.

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Equivalent Noise Temperature Representation for Scaled MOSFETs

IEICE Transactions on Electronics ◽

10.1587/transele.e93.c.1550 ◽

2010 ◽

Vol E93-C (10) ◽

pp. 1550-1552

Author(s):

Hiroshi SHIMOMURA ◽

Kuniyuki KAKUSHIMA ◽

Hiroshi IWAI

Keyword(s):

Noise Temperature ◽

Equivalent Noise Temperature

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Design of 300 GHz Combined Doubler/Subharmonic Mixer Based on Schottky Diodes with Integrated MMIC Based Local Oscillator

Electronics ◽

10.3390/electronics9122112 ◽

2020 ◽

Vol 9 (12) ◽

pp. 2112

Author(s):

José M. Pérez-Escudero ◽

Carlos Quemada ◽

Ramón Gonzalo ◽

Iñigo Ederra

Keyword(s):

State Of The Art ◽

Schottky Diodes ◽

Noise Temperature ◽

Local Oscillator ◽

The State ◽

Experimental Characterization ◽

Conversion Loss ◽

Equivalent Noise Temperature ◽

Factor Technique

In this paper the design and experimental characterization of a combined doubler-subharmonic mixer based on Schottky diodes which uses a 75 GHz MMIC based local oscillator is presented. This solution integrates in the same substrate the doubler and the mixer, which share the same metallic packaging with the local oscillator. The prototype has been fabricated and measured. For characterization, the Y-Factor technique has been used and the prototype yields a best conversion loss and equivalent noise temperature of 11 dB and 1976 K, respectively, at 305 GHz. This performance is close to the state of the art, and shows the potential of this approach, which allows a significant reduction in terms of size and volume.

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A new method to obtain total power receiver equivalent noise temperature

33rd European Microwave Conference, 2003 ◽

10.1109/eumc.2003.1262292 ◽

2004 ◽

Author(s):

B. Aja ◽

J.P. Pascual ◽

L. de la Fuentel ◽

J. Gallegos ◽

E. Artal

Keyword(s):

Noise Temperature ◽

New Method ◽

Total Power ◽

Equivalent Noise Temperature

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A Millimeter-Wave 4th-Harmonic Schottky Diode Mixer with Integrated Local Oscillator

Applied Sciences ◽

10.3390/app11167238 ◽

2021 ◽

Vol 11 (16) ◽

pp. 7238

Author(s):

José M. Pérez-Escudero ◽

Carlos Quemada ◽

Ramón Gonzalo ◽

Iñigo Ederra

Keyword(s):

Millimeter Wave ◽

Schottky Diode ◽

Experimental Validation ◽

State Of The Art ◽

Schottky Diodes ◽

Noise Temperature ◽

Local Oscillator ◽

Conversion Loss ◽

Fourth Harmonic ◽

Equivalent Noise Temperature

In this paper the design and experimental validation of a fourth-harmonic mixer based on Schottky diodes working around 300 GHz is presented. The main novelty of this work consists in the integration of an MMIC-based local oscillator, working around 75 GHz, and a mixer in the same metallic block housing. A prototype has been characterized using the Y-Factor method and yields a best measured conversion loss and an equivalent noise temperature of 14 dB and 9600 K, respectively. This performance is comparable to the state-of-the-art for this type of mixer.

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