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Proceedings Paper

Frequency multiplier response to spurious signals and its effect on local oscillator systems in millimeter and submillimeter wavelengths
Author(s): Goutam Chattopadhyay; Erich Schlecht; Frank Maiwald; Robert J. Dengler; John C. Pearson; Imran Mehdi
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Paper Abstract

Broadband fixed-tuned frequency multipliers in conjunction with broadband power amplifiers driven by frequency synthesizers are often used as local oscillator (LO) sources in the millimeter and submillimeter wave heterodyne instruments. At these frequencies the multipliers use Gallium Arsenide (GaAs) based Schottky varactor diodes as the nonlinear element, and like most other harmonic generators are susceptible to spurious signal interference. The state-of-the-art LO sources in the millimeter and submillimeter wavelengths use MMIC power amplifiers producing in excess of 250 mW of output power in the 100 GHz range, and they are used to drive the subsequent multiplier stages. Because of the high input power environment and the presence of noise in the system, the multipliers become vulnerable to spurious signal interference, either through the bias lines or through the RF port. As the spurious signals propagate through the multiplier chain, they generate inter-modulation products which might fall in the passband of the heterodyne instrument and seriously degrade its performance. The issues of frequency multiplier response to spurious signal interference and its effect on local oscillator performance in millimeter and submillimeter wave heterodyne instruments are investigated. Results of numerical harmonic balance simulations and laboratory experiments are presented here, and are found to show good agreement.

Paper Details

Date Published: 17 February 2003
PDF: 9 pages
Proc. SPIE 4855, Millimeter and Submillimeter Detectors for Astronomy, (17 February 2003); doi: 10.1117/12.459195
Show Author Affiliations
Goutam Chattopadhyay, Jet Propulsion Lab. (United States)
Erich Schlecht, Jet Propulsion Lab. (United States)
Frank Maiwald, Jet Propulsion Lab. (United States)
Robert J. Dengler, Jet Propulsion Lab. (United States)
John C. Pearson, Jet Propulsion Lab. (United States)
Imran Mehdi, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4855:
Millimeter and Submillimeter Detectors for Astronomy
Thomas G. Phillips; Jonas Zmuidzinas, Editor(s)

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