| 摘要 |
A frequency reference is employed to correct a frequency error in a signal synthesizer. The frequency reference provides a reference frequency with a parts per million deviation from the reference's nominal frequency. The reference frequency parts per million deviation is equal in magnitude to the parts per million deviation of the frequency error from a desired signal synthesizer output frequency. The deviation in the reference frequency offsets the deviation from the desired output frequency to significantly reduce the frequency error. The frequency reference includes a voltage controlled oscillator, programmable voltage generator, and voltage control engine. The reference frequency is set by the voltage controlled oscillator in response to a frequency setting voltage from the programmable voltage generator. The voltage control engine is coupled to the programmable voltage generator to provide a voltage setting value that controls the frequency setting voltage.
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