Oscillator frequency control
AssigneeSony Ericsson Mobile Communications AB
InventorsBo Lindell, Robert Kristiansson
Life of this patent
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Abstract
A control unit supplies a new control value to a frequency source. The value is determined by the frequency source frequency and the reference frequency. The control unit further calculates a rate of change value based at least on the new and a previous control value if there is communication with the reference frequency generator and stores these values in corresponding stores. Another control unit calculates a new control value based on the rate of change value from the rate of change store and the last used control value from the control value store and supplies the new control value to the frequency source if there is no communication with the reference generator.
Claims18
A portable electronic device configured to communicate with a reference frequency generator comprising:
- a receiving unit configured to receive a reference frequency,
- a frequency source configured to generate a frequency of the device, and
- at least one control unit configured to supply a new control value to the frequency source, said value being determined by the frequency source frequency and the reference frequency and to calculate a rate of change value at least based on the new and a previous control value if there is communication with the reference generator, and configured to calculate the new control value based on the rate of change value and a last used control value and to supply the new control value to the frequency source if there is no communication with the reference generator.
An apparatus comprising:
- a control device for a frequency source that uses an external reference frequency generator, the control device being configured to supply a new control value to the frequency source, said value being determined by the frequency source frequency and the reference frequency and to calculate a rate of change value at least based on the new and a previous control value if there is communication with the reference generator, and configured to calculate the new control value based on the rate of change value and a last used control value and to supply the new control value to the frequency source if there is no communication with the reference generator.
A method of regulating a frequency source in a portable electronic device, comprising:
- if there is communication with the reference generator:
- supplying a new control value to the frequency source, said value being determined by the frequency source frequency and the reference frequency;
- and
- calculating a rate of change value at least based on the new and a previous control value;
- if there is no communication with the reference generator:
- calculating a the new control value based on the rate of change value and a the last used control value;
- and
- supplying the new control value to the frequency source.
Dependencies are inferred from the claim text.