Oscillators – Beat frequency – Frequency or amplitude adjustment or control
Patent
1982-08-02
1985-05-07
LaRoche, Eugene R.
Oscillators
Beat frequency
Frequency or amplitude adjustment or control
331 42, 331 49, 331 53, H03B 2101
Patent
active
045160856
ABSTRACT:
Disclosed is a low noise microwave frequency synthesizer having a plurality of rapidly switchable output frequencies. Two banks of oscillators are selectively mixed to yield a range of output signals of low phase noise and low spurious noise. The first bank of oscillators comprises low noise, highly stable oscillators of a frequency range below the desired synthesized output signal. The second bank of oscillators comprises low noise, highly stable oscillators of a frequency range lower than the first bank. The signal from the second bank of oscillators is frequency multiplied to a desired frequency range by a low multiplication factor and then mixed with the signal from the first bank of oscillators. Multiplied phase noise is reduced by using a low multiplication factor. The upper sideband of the mixed signals is output as the synthesized output signal. Rapid switching between oscillators in both banks provides a frequency range of synthesized output signals which may be rapidly stepped through as desired.
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A. J. Budreau, A. J. Slobodnik, P. H. Carr, A Review of Saw-Based Direct Frequency Synthesizers, 8099 IEEE Transactions on Microwave Theory and Techniques, vol. MTT-30, May 1982, No. 5, pp. 686-693.
Docter Richard
Effinger David D.
Hughes Aircraft Company
Karambelas A. W.
LaRoche Eugene R.
Pascal Robert J.
Runk Thomas A.
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