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A 10 kHz to 400 MHz synthesized frequency converter.

Introduction

The model 9040-T(A) versatile frequency converter is one of the first of its kind to implement imageless mixers and SAW filters to provide 50 dB dynamic range. Utilizing single sideband upconversion as well as imageless downconversion, the model 9040-T(A) allows the user to maximize a clean (imageless and anti-aliased) converted bandwidth, which would be unattainable in traditional frequency converters. Also incorporated into the design are multisection group delay equalizers that minimize the effects of group delay distortion.

Applications

Typical applications for the 9040-T(A) are as front ends for digital systems, synthesized super tuners and general purpose frequency converters in lab use. As a front end for digital systems, the 9040-T(A) is able to meet the required 50 to 60 dB dynamic range prior to 10 to 12 bit digitization and provides +100, -97 percent of usable bandwidth to be digitized vs. undersampling to create bandpassing. In the synthesized super tuner application, the unit can convert 1 to 100 MHz of bandwidth to baseband or other IFs for further processing. This allows a user to remove a predetected 1 MHz chunk of the spectrum in a dense signal environment and translate it to any output center frequency from 10 kHz to 400 MHz. In lab use as a general purpose frequency converter, the problem of IF incompatibility is resolved. Upon selection of an input/output via the front panel or IEEE-488, the 9040-T(A) provides a virtually transparent bandpassed IF between dissimilar products.

The model 9040-T(A) has the features and capabilities of coherent frequency conversion, synthesized frequency tuning, imageless mixer and SAW filtering, local or IEEE-488 control, 50 dB dynamic range and 70 dB image rejection downconversion. The 9040-T(A) unit has the capability to convert any input frequency into the tunable range of 10 kHz to 400 MHz, including IFs of 70/ 140/160/300/400 and 1000 MHz to any output frequency in the tunable range of 10 kHz to 400 MHz, including output IFs of 70/140/160/300 and 400 MHz. Fixed group delay equalizers provide output center frequencies of 3/6/10/15/20/25/ 30/40 and 50 MHz. Imageless mixers are used for conversions up to the 120 MHz bandedge.

In addition to up and downconversion capability, the 9040-T(A) also functions as a selectable filter with 14 bandwidths of 1/2/4/6/8/ 10/12/20/30/40/50/60/80 and 100 MHz and a bypass mode. Bandwidths of [+ or -] 100 percent of any center frequency in the tunable range also can be selected but are limited by the bandedges of each frequency band range. The maximum bandwidth in any mode of operation is 100 MHz (optionally 200 MHz).

The 9040-T(A) is housed in a standard EIA rack-mountable chassis, which employs gaskets, solid coaxial cables and a machined housing for critical subassemblies. The power line is isolated by multi-section filters to conform to TEMPEST EM/RFI design.

Future Enhancements

Future enhancements of the model 9040-T(A) include a phase coherent multichannel converter and an optimized bandwidth analog-to-digital converter. The model 9040-T(A) was designated to operate in a slaved (common local oscillator) configuration to provide up to eight channels of phase coherent baseband. By centering the output bandwidth to an optimum input/sample rate to an A/D converter the output device, such as an FFT, or a digital recorder, can benefit fully from the clean conversion of the 9040-T(A).
COPYRIGHT 1992 Horizon House Publications, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1992 Gale, Cengage Learning. All rights reserved.

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Title Annotation:Product Feature
Publication:Microwave Journal
Article Type:Product Announcement
Date:May 1, 1992
Words:577
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