Digital tuning device
OwnerPaul A. Ryaninventor
Life of this patent
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Abstract
A digital tuning device for accurate selectable tuning of a resonant circuit. The inductive and capacitive elements of the resonant circuit are connected by a transformer device whose turns ratio is variable in accurate digital increments. Since the reflected reactance is related to the square of the turns ratio and since the resonant frequency varies as the inverse square root of the reactance, the resonant frequency of the circuit is directly related to the turns ratio.
Claims9
A resonant circuit with a resonant frequency which is accurately selectable in digital increments corresponding to digital increments of a turns ratio of a transformer means included in said resonant circuit, said resonant circuit comprising,
- inductive means,
- capacitive means,
- transformer means with input and output terminals said output terminals having a fixed number of windings therebetween said transformer means having accurately selectable turns ratio in digital increments,
- said capacitive means connected to said output terminals of said transformer means and said inductive means connected to said input terminals,
- whereby said circuit resonants at a frequency which is directly proportional to said turns ratio and variations in said turns ratio produce directly proportional variations in said resonant frequency.
Dependencies are inferred from the claim text.