Frequency synthesis and noise reduction
AssigneeBAE SYSTEMS plc
InventorsRobert John Mark Longstone, Ian Morrison Graham
Life of this patent
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Abstract
A frequency synthesizer and oscillator are disclosed for reducing noise in processed signals. The synthesizer and oscillator comprise an array of frequency dividers adapted to receive an input signal, which is derived from a single signal source having a prescribed frequency. The synthesizer and oscillator further comprise at least one frequency multiplier coupled to at least one of the frequency dividers, such that in use, the dividers and the at least one multiplier are operable to generate a plurality of frequencies which are coherent with the prescribed frequency. A regulated power supply is also disclosed comprising a filter and first and second regulators, for reducing noise in the output voltage of the power supply.
Claims16
A local oscillator, comprising:
- a signal source for generating an input signal having a prescribed frequency;
- a first oscillator and a second oscillator coupled via a first signal path with the signal source;
- an array of frequency dividers coupled via a second signal path with the signal source;
- at least one frequency multiplier coupled to at least one of the frequency dividers;
- and
- a switch coupled to the array of frequency dividers and the at least one frequency multiplier,
- wherein in use, the frequency dividers and the at least one multiplier are operable to generate a plurality of harmonic frequencies coherent with the prescribed frequency for selectively combining with output from the oscillators on the first signal path to generate an output signal having a target frequency, the switch being operable to select which of the plurality of harmonic frequencies is to be combined, and,
- wherein the array of frequency dividers and at least one multiplier are arranged to generate the harmonics frequencies such that they are evenly spaced relative to each other.
Dependencies are inferred from the claim text.