Oscillator with a noise reduction function, a writer, and a method of controlling a writer
AssigneeSeiko Epson Corporation
InventorsTakashi Endo, Yoichi Fujii
Life of this patent
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Abstract
An oscillator 10 with a noise reduction function has a memory 80 that memorizes modulation data DM for performing the spread spectrum modulation input from an output terminal fout, a modulation signal output circuit 60 that generates a modulation signal SM from the modulation data DM memorized in the memory 80, and a mixer 53 that overlays the modulation signal SM on the control voltage VC of a voltage control oscillator (VCO) 54 of a PLL circuit 50, and it becomes possible to output a spread spectrum modulated output signal CLv under a specification desired by a user by memorizing in the memory 80 the modulation data DM that corresponds to the spread spectrum modulation the user tries to set.
Claims12
An oscillator with a noise reduction function comprising:
- an oscillation means that outputs a first reference signal;
- a memory means where modulation data for performing spread spectrum modulation are selectively memorized, a write control means that writes modulation data to the memory means, and rewrites and erases modulation data memorized in the memory means according to externally input data;
- a modulation signal output means that generates modulation signals from the modulation data and outputs the modulcation signals;
- and
- a reference signal output means that outputs one of a second reference signal at a frequency which is a multiple of the frequency of the first reference signal when the modulation signal is not input, and a third reference signal wherein the second reference signal is spread spectrum modulated based on the modulation signal when the modulation signal is input.
Dependencies are inferred from the claim text.