Arbitrary frequency signal generator
AssigneeDr. Michael Gude
InventorJoerg Ciesielski
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Abstract
The present invention is based on the objective of constructing a PLL as arbitrary frequency generator for frequency multiplication purposes without utilizing a VCO. The invention shows a solution which can be realized with a pure digital circuit which can be easily integrated on a chip. In digital oscillators, the frequency can be changed, by changing over the number of time-delay elements. It is also possible to realize very slight frequency changes per switching stage by changing over between different elements with very similar delay times. In addition, a pulse-width modulator is utilized that periodically changes over between two or more of these stages and consequently different frequencies. Furthermore a PLL is introduced using such a frequency generator.
Claims6
A frequency generator with digitally adjustable frequency for an integrated circuit, comprising an oscillator that consists of gates or similar time-delay elements and the frequency of which can be adjusted stage-by-stage, as well as a pulse-width modulator, characterized in that an arbitrary output frequency is generated by continuously changing over between at least two different frequencies.
Dependencies are inferred from the claim text.