High Frequency Signal Sources Using Surface Acoustic Wave (SAW) Technology.
Final technical rept. 8 Jun 76-8 Aug 77,
UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CONN
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Stabilized comb spectra generators using SAW Technology have been developed for operation at 333 MHz and higher frquencies. These signal sources and an additional CW source at 1984 MHz are being developed to provide precision signals for a rapid frequency hopping frequency synthesizer. The comb spectrum generator is based upon the Mode Locked SAW Oscillator MLSO, a regenerative rf pulse oscillator. Stabilization, i.e., synchronization to a 1 MHz reference signal, is accomplished through injection locking of the MLSO at the fundamental rf frequency. The stabilization signal is provided by means of a Phase Locked Loop oscillator that is assembled from commercially available IC components. The first complete prototype consists of two four inch square circuit boards and consumes about five watts of power. This first prototype operating at 333 MHz generates the desired spectral lines 9 lines spaced 3 MHz apart and the signal characteristics closely satisfies the goals of the program both for low FM noise and spurious signals. The judicious use of SAW filters was important for meeting the program goals. These SAW filters together with the IC components made possible a small compact package that can be even further reduced in size with further development. Preliminary results with the 828 MHz MLSO and the 1984 MHz CW source are also promising. Author
- Line, Surface and Bulk Acoustic Wave Devices