Journal ArticleDOI
Down-converters using Schottky-barrier diodes
TLDR
In this article, the analysis of noise in down-converters, in which signal and image ports are equally terminated, is extended to include the effect of a nonlinear junction capacitance.Abstract:
The analysis of noise in down-converters, in which signal and image ports are equally terminated, is extended to include the effect of a nonlinear junction capacitance. The theory is applied to Schottky-barrier diodes, which are represented by a constant resistance in series with a parallel combination of a nonlinear conductance and nonlinear capacitance pumped in phase. Using numerical optimization procedures, the minimum overall receiver noise figure, the associated conversion loss, and the required optimum external terminations are calculated and compared with experimental results. It is shown that in a resistive mixer with equal termination of signal and image ports, the addition of a nonlinear capacitance can lower the conversion loss substantially; but the overall noise figure remains nearly invariant. A conversion loss as low as 3.5 dB was measured (3.3 dB calculated) for a silicon Schottky-barrier diode operated at 3 GHz, driven by 0.1 mW LO power, and without dc bias. The overall noise figure, including an IF amplifier noise figure of 1.5 dB, however, stays at 5.7 dB (5.5 dB calculated).read more
Citations
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Journal ArticleDOI
Noise and Loss in Balanced and Subharmonically Pumped Mixers: Part I--Theory
TL;DR: In this paper, the authors developed the theory of noise and frequency conversion for two-diode balanced and subharmonically pumped mixers, and derived expressions for the conversion loss, noise temperature, and input and output impedances in a form suitable for numerical analysis.
Journal ArticleDOI
Harmonically Pumped Stripline Down-Converter
TL;DR: In this paper, a thin-film down-converter which is pumped at a submultiple of the local-oscillator frequency has given a conversion loss which is comparable to the performance of conventional balanced mixers.
Journal ArticleDOI
Nonlinear, Linear Analysis and Computer-Aided Design of Resistive Mixers
TL;DR: In this paper, a nonlinear large-signal analysis of local current shape and linear small signal analysis for resistive mixers are made for resistivisual mixers, and the conjugate match method is used to find the minimum conversion loss.
Journal ArticleDOI
Nonlinear Analysis of the Schottky-Barrier Mixer Diode
D.A. Fleri,L.D. Cohen +1 more
TL;DR: In this paper, the junction-voltage waveshapes resulting from a 9.375 GHz sinusoidal localoscillator generator voltage are computed for three common equivalent-circuit models of the Shottky-barrier diode.
Journal ArticleDOI
Performance and stability of schottky barrier mixers
TL;DR: In this article, the Schottky barrier diode was used as a mixer with a constant series resistance and was shown to achieve an arbitrarily high conversion gain with a minimum of about 0.7 dB and a maximum of about 2.3 dB.
References
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Journal ArticleDOI
Noise Figure and Conversion Loss of the Schottky Barrier Mixer Diode
TL;DR: In this paper, it was shown that Schottky diode mixers should exhibit single sideband noise figures as low as 3 dB at X band when used in conjunction with 1.5 dB noise figure IF amplifiers, provided the cutoff frequencies higher than 500 GHz.
Journal ArticleDOI
Analysis of thermal and shot noise in pumped resistive diodes
TL;DR: In this paper, it was shown that the noise behavior of a pumped resistive diode which does not contain 1/f noise sources can be derived in a very simple way from Nyquist's theorem.
Journal ArticleDOI
Theory and Operation of Crystal Diodes as Mixers
G. C. Messenger,C. T. McCoy +1 more
TL;DR: In this paper, the effects of barrier resistance, barrier capacity, and spreading resistance of a crystal diode are quantitatively related to its fundamental physical properties and geometrical construction.
Journal ArticleDOI
Frequency conversion by means of a nonlinear admittance
TL;DR: In this article, a mathematical analysis of a heterodyne conversion transducer in which the nonlinear element is made up of a nonlinear resistor and a non linear capacitor in parallel is presented.
Journal ArticleDOI
Noise-Figure Reduction in Mixer Stages
TL;DR: The noise of triode and multigrid mixer stages is shown to be reducible to the value for a comparable triode amplifier stage by the application of proper feedback, in some cases this reduction amounts to 15 decibels or more.