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The DIGILATOR, a New Broadband Microwave Frequency Translator
- Source :
- IEEE Transactions on Microwave Theory and Techniques. 15:172-179
- Publication Year :
- 1967
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 1967.
-
Abstract
- Frequency translation of an RF wave can be accomplished by subjecting it to a constant rate of phase shift or by applying an ideal repetitive sawtooth phase function which snaps to zero at 360 degrees (serrodyne modulation). The DIGILATOR is a new type of frequeucy translator which employs a multibit latching ferrite phase shifter with a suitable digital switching driver to obtain a multiple-step approximation to the serrodyne phase function. This paper reviews the theory of an N-step DIGILATOR and describes the design of a 16-step, X-band device. Experiments showed that performance is independent of microwave frequency over the design frequency band of the phase shifter. The carrier and close-in sidebands were suppressed by 39 dB and predicted far-out sidebands were within 1 dB of theoretical amplitudes.
Details
- ISSN :
- 00189480
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Microwave Theory and Techniques
- Accession number :
- edsair.doi...........175d877f0066e376981a3e96c9e580f9