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4 edition of Noise temperature and IF bandwidth of a 530 GHz diffusion-cooled hot-electron bolometer mixer found in the catalog.

Noise temperature and IF bandwidth of a 530 GHz diffusion-cooled hot-electron bolometer mixer

Noise temperature and IF bandwidth of a 530 GHz diffusion-cooled hot-electron bolometer mixer

presented at the sixth International Symposium on Space Terahertz Technology, March 21-23, 1995, Pasadena, California

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English


Edition Notes

StatementA. Skalare ... [et al.].
Series[NASA contractor report] -- NASA-CR-203129., NASA contractor report -- NASA CR-203129.
ContributionsSkalare, A., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17593604M
OCLC/WorldCa41084816

B = bandwidth in Hz. Thermal noise calculations for room temperature. It is possible to calculate the thermal noise levels for room temperature, 20°C or °K. This is most commonly calculated for a 1 Hz bandwidth as it is easy to scale from here as noise power is proportional to the bandwidth. The most common impedance is 50 Ω. Hot electron bolometers (HEB) made from high-TC superconducting YBa2Cu3O7–x (YBCO) oxide nano-constrictions are promising THz mixers, due to their expected wide bandwidth, large mixing gain, and low intrinsic noise. The challenge for YBCO resides, however, in the chemical reactivity of the material and the related aging effects. In this paper, we model and simulate the frequency dependent Cited by: 3.

Spectral Power Density of (white) Noise • Amount of thermal noise to be found in a bandwidth of 1Hz in any device or conductor is: • N 0 = noise power density (in watts) per 1 Hz of bandwidth • k = Boltzmann's constant = × J/K (or W/ ()) • T = temperature, in kelvin (absolute temperature) • Note Watt = J/sec = Size: 1MB. Equivalent Noise Temperature. The equivalent noise temperature of a system is defined as the temperature at which the noise resistor has to be maintained so that by connecting this resistor to the input of a noiseless version of the system, it will produce the same amount of noise power at the system output as that produced by the actual system.

Year author Technology Frequency Noise temperature R.H. Frater GaAs MESFET GHz 50 K L.P. Dunleavy μm InP HEMT 18 GHz K P.M. Buhles μm GaAs MHEMT GHz GHZ 90 K K N. Skou GaAs PHEMT GHz 77 K C. Bredin 70 nm GaAs MHEMT GHz 72 K Introduction Active cold loads. Pergamon Ada Aslronautica, Vol. 39, No. , pp. , Published by Eisevier Science Ltd PII=S(97)^ on^S^o ADVANCED DETECTORS AND INSTRUMENTS FOR SMALL SATELLITES Rainer : Rainer Sandau, Gerhard Schwaab, Ingo Walter, Jürgen Wolf.


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Noise temperature and IF bandwidth of a 530 GHz diffusion-cooled hot-electron bolometer mixer Download PDF EPUB FB2

In conclusion, the first Y-factor measurements with a diffusion cooled hot-electron bolometer mixer has yielded a lowest receiver noise temperature of K and an estimated conversion efficiency of dB DSB at a local oscillator frequency of GHz.

Not Available Noise Temperature and IF Bandwidth of a GHz Diffusion-Cooled Hot-Electron Bolometer MixerCited by: 2. Noise Temperature and IF Bandwidth of a GHz Diffusion-Cooled Hot-Electron Bolometer Mixer Article (PDF Available) April with 3 Reads How we measure 'reads'.

We report on the first heterodyne measurements with a diffusion-cooled hot-electron bolometer mixer in the submillimeter wave band, using a waveguide mixer cooled to K. The best receiver noise temperature at a local oscillator frequency of GHz and an intermediate frequency of GHz was K (double sideband).

Get this from a library. Noise temperature and IF bandwidth of a GHz diffusion-cooled hot-electron bolometer mixer: presented at the sixth International Symposium on Space Terahertz Technology, March, Pasadena, California.

[A Skalare; United States. National Aeronautics and. The best receiver noise temperature at a local oscillator frequency of GHz and an intermediate frequency of GHz was K (double sideband). The 3 dB IF roll-off frequency was around to GHz, with a weak dependence on the device bias : Anders J.

Skalare, William R. McGrath, Bruce Bumble, Henry G. LeDuc, P. Burke, A. Verheijen, D. We report on the first heterodyne measurements with a diffusion-cooled hot-electron bolometer mixer in the submillimeter wave band, using a waveguide mixer cooled to K.

The best receiver noise temperature at a local oscillator frequency of GHz and an intermediate frequency of GHz was K (double sideband).

The 3 dB IF roll. We present studies of the input and output noise of diffusion cooled hot-electron bolometer mixers. By simultaneously measuring the gain and noise (with a 14 GHz LO) as a function of intermediate.

We have fabricated Nb diffusion-cooled hot electron bolometers for a waveguide mixer around GHz. The device in this work is a thin (12 nm) Nb bridge with a length and width of nm and is defined by a two-step electron beam lithography : DW Floet, [No Value] Gao, W Hulshoff, H van de Stadt, TM Klapwijk, AK Suurling.

a second contribution which dominates at higher frequency. The noise bandwidth is larger than the gain bandwidth, and the mixer noise is low, between and K ~double side band!.© American Institute of Physics.

@S~98!# Recent research on hot-electron bolometer mixers has enhanced the prospect of achieving quantum-noise. resistance versus temperature curve of a diffusion cooled bolometer to determine its thermal conductance, and to calculate from this value the highest usable intermediate frequency.

The other objective was to adapt an existing GHz SIS receiver for use with hot electron. If you begin with a system at room temperature ( K) and add a component at the input that itself has a noise temperature of K, the doubling of noise power increases the overall noise figure by 3 dB (2*=).

A 6 dB increase is a 4x increase in noise power (4*=). Cascaded noise temperature is done just like with noise figure.

in diffusion and phonon-cooled superconducting hot-electron bolometer mixers which will serve as ultralow noise detectors in THz heterodyne receivers.

The conversion efficiency and output noise of devices of varying lengths were measured with radio frequency between 8 and 40 GHz. The devices.

sources. Even though the atmospheric noise temperature (nearly the same as the brightness temperature) increases as the attenuation increases, its upper limit (about to K) is the ambient temperature (mean atmospheric physical temperature) when looking upward, or the earth's surface temperature when looking downward.

Noise figure should be thought of as separate from gain. Once noise is added to the signal, subsequent gain amplifies signal and noise together and does not change the signal-to-noise ratio.

Figure (a) shows an example situation at the input of an amplifier. The depicted signal is 40 dB above the noise. The achieved noise temperature in practical mixers is approximately 10 times higher than the quantum limit, TQ = hv/kB. The intermediate frequency (IF) bandwidth, BIT', is given by the inverse electron cooling time, 1-c, i.e., BIF = Irr,).

The maximum IF bandwidth of GHz has been demonstrated in an ultrashort diffusion-cooled Nb mixer [3]. Get this from a library. Noise temperature and IF bandwidth of a GHz heterodyne receiver employing a diffusion-cooled superconducting hot-electron mixer.

[A Skalare; United States. National Aeronautics and Space Administration.;]. The IF chain is made up of a bias-T, a wide-band cryogenic low noise amplifier (CITLF4) with a gain of ~30 dB and a noise temperature of GHz, and room temperature amplifiers with a gain of ~70 dB over –12 GHz.

The equivalent noise temperature of the IF chain is approximately equal to 18 by: 8. Antenna noise: antenna losses + sky noise (background microwave radiation) Antenna noise temperature: Antenna noise temperature is the temperature of a theoretical resistor at the input of an ideal noise-free receiver that would generate the same output noise power per unit bandwidth as that at the antenna output at a specified frequency.

The low noise amplifier (LNA) design is one of the biggest challenges in a UWB system. The UWB LNA [8] [9] should have lowest noise figure possible to reduce the system noise temperature, and provide sufficient flat gain to suppress noise temperature contributed from the.

Performance at GHz of a Diffusion-Cooled Nb Hot-Electron Bolometer Mixer Noise and RF Bandwidth Measurements of a THz HEB Heterodyne Receiver A Low-Noise Superconductive Nb Hot-Electron Mixer at THz Conversion Loss of a Resistive State Superconducting Mixer J. Kawamura, R. Blundell, C-Y.E. Tong, SAO G.

Gol'tsman, E. Gershenzon, B.Since niobium tri-layer technology is by far the most successful SIS-mixer technology and since the RF loss will be significant above the energy gap of niobium [6], it may be very difficult to realise SIS mixers with a noise temperature limited to a few times the quantum limit (T mixer≈ ≈hf/k) above about : E.

L. Kollberg.KEYWORDS: Terahertz radiation, Receivers, Antennas, Niobium, Heterodyning, Bolometers, Temperature metrology, Resistance, Aerospace engineering, Diffusion Read Abstract + We report on the development of quasioptical Nb hot-electron bolometer mixers .